I've always had really bad shoulder flexibility. I was a dancer for 14 years and my teachers were constantly telling me to push my shoulders back, and I used to get so frustrated because I felt like I physically couldn't put my shoulders back any farther. I never knew my problem was shoulder flexibility until I had decided a little over a year ago that I wanted to get into gymnastics. I started doing some stretches at home and realized I couldn't even straighten my arms in a bridge. It was actually my younger sister who told me it was that my shoulders were very tight. I've been working on my shoulders since then and I've seen a huge improvement. I worked on lots of kickovers off of raised surfaces (where my feet were high enough that I was able to press into my shoulders). I also did some of the things in the gymnasticminute videos on youtube for shoulder flexibility, and I do bridges with my hands toward a wall and try to push my shoulders towards the wall. Since I'm an adult, it's taking a little longer to get the flexibility than it probably will for your daughter, but I'm at the point where I can almost kickover from the ground, and I my shoulders are pretty much over my hands with my arms straight in my bridge. Your daughter has probably been working on things like bridge kickovers so I'm sure her flexibility will increase over time just from doing those things.