my grandma is living and won't meet her first great grandchild 😞 very long story

Growing up, I was really close to my maternal grandmother. Her house was basically my second home. She and my mom never had the best relationship but that didn't change how much I loved her. When I got pregnant I was terrified to tell her even though I'm 21 and have been with the same guy for almost 4 years. She's very religious and judgemental, honestly. I actually didn't even tell her myself. I let my aunt and mom do it. She sent me a 10 pg text about how I was ruining my life and how she never liked my boyfriend and didn't think he'd make a good dad. It was really harsh but she's my grandma so I replied respectfully even though I was hurt. Beyond that, I didn't talk to her about my pregnancy at all. A couple months later, she planned a trip to California to visit my uncle, his wife and new baby. She asked if I wanted to go and offered to pay. I declined at first because I knew I didn't have the money to pay her back and I told her that. She said it was fine and I didn't have to repay her. She just asked that I brought spending money. I was still hesitant, but the rest of the family (aunt,cousin and family friend)was going, so I agreed. This was back in June. We get to California, have a great time, now it's the night before we head home. My uncle is a musician and had to catch a flight out of town for a show that night. He asked my cousin (his daughter) and myself if we'd watch the baby so his wife could drop him off at the airport. Of course we said yes. The baby was the purpose for the trip. He took my cousin and i out to dinner with his wife before they left for the airport. My grandma and aunt declined dinner because they wanted to go shopping. Fine. I didn't have the money or luggage space to shop so I went to dinner. We got to my unlces house at around 9pm and he left for the airport.  My cousin and I were sitting around (baby was sleep) when all of sudden her phone is ringing off the hook. It's my grandma. She sends a 2 pg text telling us how disrespectful we are and how she shouldn't have invited us to come with. At this point, I'm confused, my cousin is confused and we had no idea what she was talking about. She knew where we were and what we were doing (so we thought). My cousin calls her right away to figure out what's going on and my grandma is literally yelling in her ear. I couldn't make out what she was saying but when the phone was hung up my cousin just had a blank look on her face. She finally tells me that our grandma was pissed that we decided to go to dinner and watch the baby. Then she tells me that our grandma also said we couldn't get on the flight home unless we paid her upfront. WHAT THE HELL? So now I'm pissed. We didn't do anything wrong. We were in downtown Burbank, which is small. My grandma was literally minutes away from us and she never once said she had a problem with us babysitting. So now I'm calling my aunt to see what she's talking about. When I picked up my phone I seen I had 3 missed calls from my grandma. So I call her instead, she sends me to voicemail. Try to call again, voicemail. Now I'm annoyed because I'm 12 weeks pregnant and being told I'm getting left across the country and I don't know why. We finally get back to the hotel (which is walking distance) at 1am. We go straight to my grandma and aunts room. At first no one answers the door. Then comes my very drunk grandma. She's literally yelling and screaming telling us how disrespectful we are. My cousin is shocked and I'm livid. I didn't do anything wrong. I kept asking how we disrespected her and never got an answer. Instead, she goes off about how dumb I am for letting my boyfriend get me pregnant and she's telling my cousin that she'll never finish her associates degree. My face is red at this point and im honestly ready to fight. She said so many nasty things for no reason. She's threatening to hit us and I finally ask how much she's had to drink. Bad idea. She flips out telling me it's none of my business and claiming she's not drunk (she clearly is). My aunt finally comes over and walks us out into the hallway. Another guest comes out of her room threatening to call security because of the yelling. My aunt apologizes to the lady who eventually goes back into her room. Now my aunt is trying to explain to us what's going on. Apparently, my grandma never knew we where at dinner with my uncle and never knew we were babysitting. My uncle told us that he'd invited her and she declined (that was a lie). My uncle never invited her and never told her we were babysitting. Now I understand why she's mad but she never told us that. Instead, she threw a drunken fit. I apologize to my aunt for this miscommunication and tell her I'm having my boyfriend book me a flight to get home. I was not about to be stranded and depending on a pissed off drunk. My aunt tried to convince me that my grandma would still let us fly back but I didn't want to take the chances. My boyfriend booked the flight and talked to me for a while on the phone because I was beyond  emotional. Fast forward to the next night. I'm back at home with my boyfriend and honestly I'm traumatized. What was supposed to be a family vacation turned into a trip from hell. But I'm glad I had him there for comfort. I told him I'd pay him back for the flight(which I did) and he was ok with that. The next day my cousin calls me crying. She took the same flight as me to get home. But my grandma is still sending her threatening text messages. My grandma wanted both her and i to pay her back for the plane tickets and of course we said no. She threatened to leave us. Nobody is going to take a threat like that lightly. After my cousin tells her no about the money, my grandma threatens to come to her house with a shotgun! At this point, I'm thinking, my grandma is completely cut off. I try to calm my cousin down. It wasn't working. So I called my grandma and told her she was acting extremely immature and told her it was unreasonable for us to pay her back considering she threatened to cancel our tickets. And now I had to pay my boyfriend back with money I didn't have to spend in the first place. We had an agreement that she'd pay for the ticket and she can't just go back on it because of a miscommunication between her and my uncle. She calls me a liar and swears she never said she was paying for it, even though it's in a text message. Then she goes on to tell me how ashamed of me she is and how she thinks I'll be a terrible mother. Fast forward to December and I'm due to have my son any day now. I haven't talked to my grandma or aunt since that day. And part of me feels really bad because I want her to meet her first great grandchild but the other part of me is still mad at her. She called me all types of names and cursed my pregnancy so many times. The closer I get to my due date the more emotional I feel about this because she was literally like a second mom to me growing up. I can't believe she acted the way she did and said what she said. I just needed to vent. I haven't talked about this since then and it's really been bothering me. If you read this whole thing, you're amazing lol.