It looks like I missed this post when it came up.
How did your doctor visits go? Surgery?
Mom has had both rotator cuffs worked on, both for range of motion as well as pain management.
The surgery helped alot with pain, and improved range of motion somewhat, although still not perfect. For her, as she got into her late 70's, one surgeon commented that it was really difficult to separate and reconnect the muscles.
Mom ended up with a complete shoulder replacement. Apparently there are two types:
Standard (ball on the humerus, socket in shoulder)
Reverse (ball in shoulder, socket on humerus).
For some things the "Reverse" shoulders are supposed to be more stable.
Good Luck