I feel awful that I have only just discovered that my DD 16 has flat feet. She does performing arts but has always had a problem with the dance aspect. She had aches in her foot the other day and after visiting her GP was informed that she has flat feet. They suggested she use insoles in her shoes, but I did not go in with her so do not know if they mean anything specific. Any body else's DC have this problem? Could this have affected her dancing? Any help appreciatated.