Unreliable/self centered BFF

So about a month ago I posted about my bff being totally unreliable and self absorbed to the point where she calls me (as I'm 30-40 weeks pregnant in actual pain) anytime she feels the need to vent about her myriad pains, illnesses, and having to take care of her dialysis stricken mother. She's mean to her mom b/c she thinks "she brought it onto herself." She says this as she downs two twisted teas before 3 pm everyday.

I was told by a few girls here that I'm just being hard on her b/c I'm pregnant/hormonal.

Well update** I'm in labor and delivery now. I knew my doctor was going to send me here today so i informed my bff of this many times this past weekend. She said great, she can't wait for me to have this baby and wants to help any way that she can... I asked her if she could pet-sit for us- absolutely. And she told all kinds of stories about how she was going to entertain our dog and be there when we needed her. Great, I figured one less thing to worry about. I declined her call today b/c I was at my doctor appt. And I haven't heard from her since. I've called, texted, and checked Facebook- she's been active all evening.

So now my husband is headed home for the 2nd time tonight to let our dog out and check on him and the cat. My MIL is going to let him stay at her house tomorrow but my husband will have to pick him up and drop him off.

Let's hope nothing progresses while he's gone for that hour.

I'm just wicked pissed that yet again she's completely bailed on me (its our wedding all over again) after I've been there for her literally anytime she's needed me. She called me the other day just to tell me a huge bird flew into her window and it broke- and that "it's a message from the heavens." Yes she drinks.

What should I do or say to her? I'm thinking about just ghosting her after all this like she has me whenever she doesn't feel like sticking to her word. I'm tired of this being a friendship of convenience. I've forgiven her and made excuses for her bailing and making poor decisions our entire friendship. So I know it's partially my fault for having any faith in her. She's 26 and lives at home and can't even make it to her one class at the local college. Time to grow tf up.

I needed to vent this out. If I were truly "just being hormonal" I would have went full verbal assault months ago.