I jst had my shoulder scoped last Tuesday to "clean out" troubles with a "Distal Clavical AC impingement" basicaly bone/calcium build up that was causeing pressure on the bursa , the only way to get relief is to remove the offending material , if its early then she may be able to get a cortisone shot in the joint and take a week of from doing much of anything with that shoulder , though the shot diden't do shit for me the surgery was a snap and recovery is going awsome. My doc is great at ortho and scopes so this helps , I have heard horror stories of people going weeks without being able to use that are.
She needs to see a Dr. for some X-rays and likely and MRI at least this way they will know what the problem is rather than making an educated guess