So now she's done with her little tantrum and wants to go back to what it was before? I've been pregnant, quite a few times, and I've never treated anyone like that. That really doesn't seem fair that she just seems to want you two to go back to your friendship because it suits her.
My first inclination is to say cancel the meet-up. On the other hand, my curiosity might get the best of me and want to see if she has any justification for her horrible treatment of you. If I went, I think I would be sitting there with an expectant look on my face waiting for an explanation AND an apology because you really, really, do deserve both. If none was forthcoming, I think I would ask very pointedly just why she behaved the way she did and why, oh why, did she think it was ok to say the horrible things she did.
I know a few people who tend to say whatever they want when they're upset or angry and when they're feeling better, all is back to normal....for them, and that is just not right. Please don't settle for the way she's treated you. I do know it's hard to lose friendships or have them turnout to not be what you thought, but you really do deserve so much better.