Does she have GOOD sneakers? Not OK, or fashionable, but GOOD? This is one area that I do not skimp on with my kids. They wear really good sneakers (we really like Brooks). I make sure that they have good arch supports in them. I actually take them to a running store that fits them, including having them run on an instore track and videoing them with the new shoes on to make sure that they aren't pronating. Bad shoes can cause so many other problems - knees, hips, back...
That being said, if she was running on concrete, that is bad. Concrete is so hard. My orthopedist when I was in college told me to never run on concrete again, that it was killing my knees.