How to deal w crazy ppl during pregnancy?!!

M
I'm dealing with 2 crazy situations...
1) my alcoholic/addict mother who has never functioned as that. She's turned this whole pregnancy into about her, messages me all day every day guilting me about seeing her when I'm trying to take space to protect myself and my baby from the unneeded stress- not to mention I barely saw her before I was pregnant. She's even invited herself to my delivery without asking if that's what I want (not gunna happen tho!) and wants me to take a vacation with her to the beach hours away from my home and hospital the month I'm due!!!! I've explained why I can't but she keeps texting about it- either bc she's blacked out and doesn't remember or really just doesn't listen to me. It hurts to have to explain this stuff.
Then I'm dealing w "a friend" who is super controlling of me and just makes me nervous in general. She wants to be at my delivery and thinks she will be- even tho I just want it to be me and my partner. 
I know I need to step into my mama bear power and stand up for myself. I'm due in 3 months& my instincts are saying it's time to stop getting pushed around emotionally. Any suggestions or anyone dealing w similar situations??