I had the same with my mother.  She would fall and be on the floor all day.  I finally moved her in with me a month ago.  She’s great, but some days has nothing nice to say about myself or my husband.  All wonderful things are said about my brother who hasn’t seen her since she moved in with me.  I’m pretty good most days, but then there’s a day of despair…  It’s hard, but worth it..