Sorry you and your family are going through this.
My opinion....if you think she's combative now.....just wait until you force her to go live somewhere she doesn't want to.
Also, I wouldn't do that to my mother.
I realize I'm only going by what you have posted, so I could be completely wrong.
But you asked for my thoughts.
This subject has been discussed in this forum many times and I have complied an Index for those looking for advice, help, and input:
https://forums.pelicanparts.com/off-topic-discussions/1130825-elderly-parent-care-index-thread.html
My best to you and your Mom!