I can relate how you feel Meg. I, being my mother's only daughter, has bared the brunt of her hostility at times. She'd swear at me; tell my brothers that she can't believe her daughter has put her "in this place" (the nursing home).
I really don't take it to heart, because it's not my mom talking, it's the disease. She's been better lately, but if something aggravates her, she's quick to snap...like even the mention of eating in the dining room at the facility. For some reason, she can turn on a dime into a nasty mode when that is even brought up. So she eats in her room and it seems to keep her disposition stable.
I've found that if I rub her back and speak softly to her, she seems to calm down when she's upset about something. I always assure her that she's always on my mind and that the main thing is that she is safe and given the care that I can't give her any longer.
Yesterday, we celebrated her 80th birthday at the facility. It went as well as expected, but as my brother and I walked her down the hall to the conference room for her small party (only 6 people) she got it in her head she was heading for the dining room and then the wall came up. Brother and I assured we were only going to a small room for her party and then she relaxed.
After we got her back to her room, she wouldn't sit down...kept saying, "I thought we were going home!" Told her that maybe later, but not right now. She still wouldn't sit and I'm holding onto her in fear she's going to fall...as she keeps falling down at least once every two weeks over there, so I said, "Mom, please sit down, I'm getting so tired here trying to hang onto you and I don't think I can anymore." She sat down immediately. All I can figure is that I acted like I was the one that needed help so she complied. I really was okay, but I was out of ideas as to how to get her to sit.
As far as losing things...mom has lost her upper partial yet again..she thinks someone took it on her, not me, but thinks the aides must have put it somewhere. When in all actuality, she probably wrapped it up in a napkin and tossed it, or left it in a pocket, or who knows. She doesn't realize that she's the one who misplaced it.
So, I guess what I'm really trying to say is that I know how much it hurts when you feel she's blaming you for things, but it's probably because she loves you the most. Try not to let it get to you; keep visiting; and I often change the subject if I see she's getting agitated about something.
Hang in there and know that if your mom was in her right mind, I'm sure she'd never dream of hurting you.
Best of luck.