When I first read your story about your Mom and her plight, I was overwhelmed. And I was thankful. My mom had dementia too but it wasn't as bad as your Mom's decline.
My heart breaks for you and your Mom.
My mom had me right after my dad died and I was cleaning out the house and dealing with my sister's bizarre ideas about selling their house. I flew with my mom from the east coast to Portland, OR where my sister had the crazy idea that she could be friends with mom. That didn't work out. And my mom went to a home for those with dementia and Alzheimers and seemed happier there than at my sister's.