This girl doesn't need a physical. She needs the injury that already exists examined by a specialist.
The injury could go unnoticed in a physical (if the patient wanted to conceal it) and a General Practitioner that did discover it would refer her to an Orthopedic Surgeon because the Doctor giving a physical would not have the proper equipment or knowledge to make a diagnosis.
It has not been established whether the OP's concerns are well founded or not.
A proper examination has not been made of the injury to determine just what the injury is. So far there is a nurses unqualified speculation about what is wrong and documented certainty that no broken bones are involved.
Nobody even knows what injury that the girl has.
If it was my child nobody could stop me from having a proper diagnosis made.