How do I tell my mom I don't want her in the birthing room?

Stefani
I'm going through my pregnancy alone, my mom has expressed that she wants to be with me when I give birth. She has a lot of psych issues and honestly her presence a lot of times just stresses me out. I love her to death but when I'm delivering I don't really want the added stress of her being there. How are y'all dealing with who you're letting in the room and who you're not?? Please no judging.