Personality change in the elderly that makes them seek conflict?

Yes, I've seen this happen which in my dad I see as combination of dementia, unhappiness with life as its become/ anger, and having a lot of time on his hands, and forgetfullness.

He will ask me to set something up, I have spent time and work getting it implemented, only for him to get mad about it and ask for its removal! Sometimes forgets when I point out that he is the one who asked for it!

I forget, Grace. Does your Mom suffer from dementia?
If so, this is rather normal in those circumstances.

First thing I would do is stop "going out of your way to make something happen".
You can tell her. I will get it next time I go shopping. Or Check your phone and tell her it is on back order or out of stock.

You say she is in Independent Living. Is that in a facility or is she living at home? If in a facility does she do the same thing with staff and other residents?

And how long has this been going on?
If this is a change in her personality it may be another stroke, it could be a UTI.
A UTI can be checked pretty easily there are OTC dip stick test strips that would give you and idea before you call her doctor.

Your mother likely has dementia brought on by her stroke(s) which causes erratic and hysterical behavior such as you've described. Get her in for a full physical and cognitive exam as soon as possible. In the meantime, practice saying Sorry mother, I can't possibly do that for you, when she asks for something, then leave her presence. Don't entertain the drama at all.

Perhaps Mom had another stroke . It can manifest as personality changes .
Also , it could be a UTI , lots of other things as well .
Have you told the doctor about this change in behavior ?