I know exactly what it feels like. My dog pulled me down a couple of years ago and my shoulder took the full brunt of landing on a storm drain curb. Broke and dislocated my shoulder. I am so sorry that the ER docs didn't knock her out to have the shoulder put back in place. They may have not wanted to chance that since she banged her head. They gave me Propofol (it's what Michael Jackson OD'd on). The ER doc called it "the good stuff". Before they knocked me out they got everybody in place (dr. up on the table w/ me, nurses holding a sheet that was wrapped around me for traction). I was out by the the letter "D" in the alphabet, shoulder was back in place and I was awake in less than 5 min. But they sent me home with a small supply of pain meds, and an appointment in the a.m. to see an orthopedic trauma guy.
If they send her to PT, see if they can give her some type of painkiller to take the edge off for those first sessions. Also, if she's not getting the motion back like they expect, try to get an MRI done (if they haven't done one by that point). I was regaining less than 50% of range of motion and almost no strength gain on my first round (21 sessions) of PT. They found that I also had an unnoticed 3 cm tear in the rotator cuff. After that was fixed, I started from scratch again, but rehabbed back to 95% of original range of motion. I have diabetes, so I think that slowed recovery down a bit as well. It took about a year, but I'm good now (at least as good as I can get at 55yo) 
Hope she's managing her pain well and able to get some rest. It was really difficult to find a comfortable position to rest or sleep in. I ended up using rolled couch throws and small pillows to support my arms and back.
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