Just wanted to let you know I'm thinking of you. From my reading here, it seems your Mom is now in hospital? This is good news, because from there - you'll get all the necessary tests and treatments done in an orderly fashion.
The thing that really jumped out at me is when Lyn* chimed in that this might not be the usual age-related dementia stuff, and that it could be a completely different situation (ie. medical/physical, and not the normal age-related memory problems that lots of people deal with).
I don't know if it helps, but one of my Grandmas had dementia/Alzheimers, and while she also experienced periods where she was a bit paranoid/weirded out, I wouldn't characterize it as aggression exactly. It was more like ...well, she had dementia (possible Alzheimers) and this is going to be very scary for someone to deal with, and because of this - it's natural to sort of blame others/point fingers at others if something's going wrong.
With my Grandma, if she couldn't find her keys or something, sometimes she used to think that maybe someone had hidden them on her. It wasn't aggression, but rather - something would go wrong or something would be missing, and she'd blame others - think that we were hiding things or stealing things from her. To me, this seems like a reasonable response when you're losing your memory and don't know what's going on. In my mind, it's easier to think that someone else must have hidden the keys than it is to think that there's something wrong with your own brain/memory. Does that make sense?
But we didn't experience the aggression that you're describing, and this is why I'm so glad that Lyn* chimed in that this isn't necessarily the norm, and that it could be something else causing the problem (something other than dementia/Alzheimers/age-related memory loss etc.)
Here's hoping your Mom is getting very good care and a good workup to find out what's really going on.
To me, it's normal to get a bit paranoid and think that people are "doing things" (moving/hiding your stuff, stealing from you etc.) if you're suffering from memory loss/dementia - easier to think that than to think that your mind is going, but I'm not so sure about the aggression part. This seems a bit different than my experience with dementia/Alzheimer's with my Grandma, but then - I'm no expert.
Hang in there and I really, really hope your Mom's situation gets resolved and treated. Agghh....this must be extremely traumatic.
Sending over some chocolates and a home cooked meal for you and one for your Dad too.
Here's hoping these goings-on with your Mom are totally temporary and are the result of some easily fixable issue.