No way - my mum is not going to be there when I deliver!! It's not that we don't get along, I just wouldn't be comfortable with her in the room.
Plus giving birth to my son & meeting him for the first time is going to be so special for my DH & I - I don't want to share that with anyone!!
That being said she hasn't asked to be there so I never had to tell her that she wasn't welcome. Your mum should understand that it's your decision though.