My mom keeps sending my blood pressure through the roof!!! Update

Liv • Taking a difficult pregnancy one day at a time.
Update: my mom isn't speaking to me and even scolded my daughter and hung up on her. She has agreed to drive her up on Thursday as agreed upon but says she and my Dad are getting a hotel because she doesn't want to see me. She is supposed to allow her house to be used for our co-ed baby shower in early August . I don't know if I should just have it somewhere else at this point. I am so frustrated. I love my mom, but I have had to go to therapy to learn how to deal with her. I don't know if I should cancel mu daughters trip and move the shower at thisnpoint. 
So I just got off the phone with my Mom and she sent my blood pressure through the roof again. I'm 23 weeks pregnant and I know this is unhealthy so I limit my interaction with her. Long story short: we arranged to send our 13 year old to spend time with her grandparents (300 miles away) and the agreement was she has to be back the following Thursday night because we have concert tickets the following Saturday and it's an hr and a half away. These tickets were a birthday present to our daughter to see her favourite band (expensive) and this was agreed upon when the trip was booked. My parents are driving her home. Now my mom is demanding to drive her home on Friday and is waging an all out war with me (her pregnant daughter fresh off of bed rest) and my passive father doesn't want to intervene because she will make his life a living hell. So do we just shell out for the expensive plane ticket home and take the control away from her or trust my Dad when he says he will make sure she gets home by Thursday? I was literally just hyperventilating and crying from anger in my room after she told me off. We won't be sending our daughter down there again for a lonnnnng time. I only do it for my Dad. So, to buy the plane ticket or not? I would love to see my Dad but I can't stand the idea of seeing her in a few weeks. Money is tight and affects this decision. 
Also, it is our anniversary that week and the husband and I will get alone time before the baby which is why we chose that week.