MIL problems, ong rant!!

Hi ladies! I need advice. I’m having a really hard time dealing with my REALLY nosy mother in law. We told her last week that we’re expecting baby #1 and she took it upon herself to call and schedule my first scan with an OB.. fine, ok, I can live with that. But now she wants to actually BE THERE for the first ultrasound, which I don’t want her to. I want that moment to be between my boyfriend and I. Also, we haven’t told my parents yet because I don’t see them until next week and she absolutely WANTS to be there when I tell them. What the heck?? When I tell her I don’t want her there because I want that moment to be intimate with my parents, she acts like I consider her like a stranger and says things like “I’m the grandma, I know your parents, I want to be there” and when I explain to her that I know my parents would want this to be intimate too, she just gives me the silence treatment. I just don’t know what to do about her anymore. She even told my bf’s little sister we would be moving to their place?? Then I said no, we’re not, we’re buying a condo (it’s literally 20 mins away, and close to my parents house) and she is TRIPPING talking about how she’s never gonna see her grandkid and he/she isn’t going to know her because of that.

I’m sorry about this long rant but I simply don’t know how to please her anymore and I feel like what I, the pregnant one, want is not as important as what she wants. What should I do?