You did a wonderful job on the quilt and accessories; they look great!
As far as the wall paint, I'm glad you decided to let her do it. All the comments here are absolutely true: paint is personal, relatively inexpensive, and can be easily changed later. More important, you let her express herself in a positive way and make memories that will last her whole life.
I would advise, like some of the others, that you let her do some or most of the work. Then when you need help painting the living room later this year, she will have experience and you can recruit her to help!
Darren