Welcome to TP. I am sorry to hear this....I don't know the laws over there,but my concern would be that if your mother is already diagnosed with AD is she still considered capable of making those decisions for herself. Those decisions meaning business. Have you talked with her gently about your ideas? I guess my question is also do you have the right to talk to her Dr. to see if he feels she is capable of those decisions still, also.
There comes a point when the law takes away our rights as a family carer (IN US....I would assume similar, but not totally)
when the AD patient has not given POA. I would find out first how capable she is and second if she is still considered capable consider do a POA (for the future)...the best is to have someone local. If she is not you may have to have a lawyer file for gaurdianship for her for you. Understand tho that by doing either you are obligated to take care of her no matter how far. I don't want to sound cruel, but I do care for my mother, in my home, and it is a lot of work, both physically, mentally.
Please look at all options for your mothers sake. Please also look into what you think may be abuse..it may not actually be what you think it is. Good luck. I hope others in the UK have a better idea on how for you to handle this as I'm not sure how closely our laws coincide...the only thing I do know is that you should consult a lawyer if you deem needed, but remember that this is a time when all of you will need to band together for your mother.
HUGS
Nancy