Ok it's been said numerous time but I agree with what everyones said here. You need to tell her.
I don't know what kind of a relationship you have with her. I know my MIL can go to hell before she thinks she's coming into the delivery room
But my mom too. I'm very close to my mom but the thought of having her there coaching me already gets under my skin. Luckily she knows I need space so she'll ask me before thinking she's welcome in the delivery room.
As for staying with you for 2 weeks... no. Sure they can come and help but it's your baby. Not hers. She's had her turn. I've seen new grandmothers completely take over and it's not right at all IMHO.
I'll allow visitors to stay for a couple of hours at a time but really I think I'm going to just want to curl up and hold my new baby all day. I think I'm going to be very clingy LOL.