@ctracy1027
Hi, not the exact same situation, just advise I keep hearing from the dementia pros: meet them where they are at in their fantasy world. Their brains are working so hard to make sense of this world and everything is jumbled.
So now your home is her home in her mind, so you may want to thank her for letting you live with her. Perhaps compliment her on her color scheme or choice of curtains, whatever just anything to keep the peace since you can't reason with them when they get an idea in their heads; it's real to them.
Hopefully her fantasies are tame and easy to go along with when they happen.
All the best to you. 🌺