A friend of mine doesnt want her mom in the delivery room and doesnt know how to tell her yet

She loves her mom a lot, but her mother always stresses her out. The mother is a bit unstable, but she means well and her heart is in the right place. My friend thinks that her mom might end up hating her for it and is looking for a way to tell her she doesnt want her there without making her mother angry. Any advice is appreciated.