She is being really weird. Are you close enough that you could say "Mom, you've been acting kind of strange throughout my pregnancy. Is everything ok"?
This would piss me right the fuck off. It's your baby and your space, she needs to back off and let you make your own decisions. Team you, all the way. Hopefully, she settles down soon, but I would definitely say something to her about it and how it's making you feel. GL!