BACK OFF 😖

So I'm pregnant with my first baby. Little girl due in 16 days 😄 my mum had been really involved in the pregnancy came to my first scan and when I had a 4d scan she was there also. I had planned on just having her and my boyfriend in the labour room with me but she has told my boyfriends grandmother she can come in and now she's saying that my sister will want to be there and she thinks it would be nice. She has literally not stopped going on about it. When I got my pram she pulled it all out the box and built it and my partner didn't even get to touch the handle cause she was pushing it about. She also keeps saying how she'll be taken my baby out in the pram and how she'll be with me everytime I got out with the baby. We're currently living with her and it's all just becoming too much. My boyfriends family live quite far away so we are planning on visiting them as much as possible when he has a day off but my mum is saying she's is having the baby every weekend. I have no idea what to do but it's seriously starting to annoy me and is causing problems between me and my boyfriend cause he feels like he and his family aren't going to be involved in our baby's life. I really wish there was some polite way to tell her to kindly back off