It should be your choice and your mum should understand. When DD2 gave birth to our only grandchild, she wanted me to be there. I told her that if, at any stage of the proceedings, she changed her mind, she should tell me and I would beat a hasty retreat. As it turned out, I was there throughout and seeing my own child give birth to her baby was the best moment of my life.
Having said all that, I was extremely close to my own dear mum but she would have been the last person I would have wanted whilst giving birth! It was just my DH who was there for all four of our babies' births, and I can understand you wanting it to be just the two of you. I'm sure your mum will understand. Good luck!
Baby Reindeer - anyone watched it?
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.