How do I politely tell MIL I don't want her in there when I deliver?

ileen 🌻🏔
So my MIL told me "once you start getting contractions or are at the hospital let me know so I can be there." I really don't feel comfortable with her wanting to be there in the room while i deliver. It's just weird. I already planned on just having my SO & sister there that's it. Like not even my mom wants to be there so why does she? I just don't want her to see something then go tell all her friends (she's very talkative) in detail, what she saw.