My daughter is feeling a pinch sensation on her right side of her chest (1 hour now). it is an on and off thing, it isn't worse with a deep breathe.

This is probably: not something serious in a 15 year old, especially if she is otherwise healthy. Was she exercising before this happened? Is she ill with a fever, cough? any other symptoms? Any history of trauma or a fall? I would recommend if it continues that she see her doctor so that the proper diagnosis, if any, can be made and treatment, if any, can be recommended.