I would go a lighter version of that pink, although it's really pretty.

One thing to think about, if you leave the walls plain pink you have many more options for decorative accents other than green.

I personally love pink and white. I live vicariously through mom's of daughters since I never had one. lol

Do you have any fabrics or a bedspread to help choose colors? As for the stripes, I would certainly have them make sense. Maybe vertical instead?

My daughter wanted her room painted pink when she was 5, so I picked a color from the Pottery Barn catalog (BM Sweet Taffy). It's bright but we really like it. I think the catalog helps you see colors in the room well. You can also see the current colors they're using at http://www.potterybarnkids.com/stylehouse