Annie, a lot of items "go missing" in senior homes. Many don't realize the item is not theirs, but it is lovely, and they want it. I'm sure this all depends on what type of senior home she is in.
With that said, a friend of mines mother loved those fancy bibs the ladies would wear to meals in the luncheon hall. If she is in one where the residents eat together she might like something like that. A bed jacket that lays on her shoulders with an easy to tie or large button or velcro. I'm in my early 60's and my hands don't have the strength they use to so she might not either. Don't want to hurt any ladies feelings but for me as I get older, somethings don't work like they use to.
Just a part of life I guess.
I do think it is very lovely of you to think of her in this way!!!