Your mom sounds a lot like mine, she also cuts out all the clippings of accidents and whenever someone dies that she knows. She has always told me how to dress my children, where I should and shouldn't go and still does to this day and I am 44. As far as guilt I would not feel guilty, I'm sure your mother knows you love her, but you need this time with your family.
My mother, as yours, would do anything for me, but I have to take care of myself and my family first in order to be there for her or anyone else.
I think you should go and enjoy yourself and not worry or feel guilty, your mother will be fine.
It's so amazing, she sounds exactly like my mother, so I can understand the guilt, I think sometimes my mother intentionally makes me feel guilty to get her way, in fact I know she does, and she usually does end up getting her way, within reason.
Go, have a wonderful time, do what you enjoy doing with your family, take care of yourself and I honestly would not feel guilty about this.
Becky