G.T.
My mother in law had it on both shoulders, one at a time, a couple of years ago. Make sure she gets some physical therapy afterwards and DOES the exercises if she wants to get full use of her shoulder again. It does take quite some time to heal up. She'll be in a sling for awhile, so she will be doing most things one handed. I remember my MIL couldnt wear a bra because she couldnt get it on. So you might think about making those kinds of things easier for her... maybe some soft sports bras that she can wiggle into. Put your own are in a sling for a day and see what challenges you face, that will give you the best idea. Also make sure she has a good heating pad and an ice pack, she'll need to use both.
What a sweet daughter :)