Any advise or comments are welcome

I am feel low right now. I know I thought I would always be prepared for when my mom dementia would start to take over. She was giving Betty whom stays with her durning the day a rough time. Betty is my mom niece. Betty went home crying. Saying my mom was mean to her.  Then Michelle comes in and my mom is looking for her baby. going through closets and thats when I came in. She was so upset about this baby I didn't know what to think.  I told her there wasn't a baby. Thats where thing go ugly. Mom tried to through little stuff I took the stuff away from here.  There was no reasoning with her. She was mad telling me  I wasn't her daughter anymore and I hurt her feelings and I felt so bad. I always promised myself taking care of my dad I would do a better job if mom came down with dementia. I failed. I am so upset I know she wasn't in a good frame of mind. I stayed  she feel asleep in her chair. Michelle woke her and she saw me she so happy to see me. I put my arms around her and hugged her told I loved her. She smiled and told me she loved me too. I know the nursing home is becoming reality and I'm just sick about it. Thanks to all whom may read this and maybe help me to forgive myself and please pray for my mom.Terrie