Whiplash injury

Hi ST I am in need of help for a friend of mine who was in a car crash more than 6 weeks ago. She got a slight whiplash injury in here back and neck. Her symptoms are:
Tightness in the sholders, upper back and neck even if doing nothing.
Turning her head and sholders is painful.

If she runs the pain all goes away but after her run she is in agony…hence not running much now!

She is seeing a physio but I am not convinced that she is getting the best treatment or advice - I could be totally wrong which is why I am seeking the help of the experts here at ST.

What kind of treatment should she be getting? are there any particular drugs that might help with pain but also to help fix the problem. Does anyone know how long this may take to heal?

Thanks
Johan