This sounds all too familiar to me....this behavior is exactly what I am dealing with, with my 80 year old grandmother that has slight(?) dementia; but she is fixated on picking at my grandfather whom has moderate dementia. She acts up all day long and is fighting her old age. The head games have been endless and are the worst part of caregiving with her. I'm not sure where the games end and the dementia begins. Be strong and take control of the situation. She is acting like a child and needs to be scolded like one. Everybody is entitled to be respected and does not deserve to be mistreated. Call her on it and see how she reacts - it may be part of the dementia, but if her behavior changes upon calling her on it - you will know. This whole role reversal is not easy.You may consider having her Alzheimer's/Dementia evaluated/re-evaluated by a doctor as well and I strongly urge you to do this.You may have her checked for a Urinary Tract Infection as well - this will mess with their heads and cause mental damage and advance the dementia - it's more common among elderly incontinent women to have a UTI.
I hope that you and your family are able to have your own "family time" together, if you don't I suggest that you read the "caregiver rights" and take them to heart. If you do not have other family members to help you out that live in the immediate area try to find community services that can come to your home and watch her or find an adult day care or a senior center to drop her off for a couple of hours. You need your time to yourself otherwise you aren't going to be worth a darn to her and your family as a caregiver. Find a Alzheimer's/Dementia support group in your area - they can help tremendously and are a wealth of information. You shouldn't be in tears everyday...please find outside assistance. I know how hard it is to laugh it off - is your sister willing to care for her for a couple of weeks?
The bathing thing is a huge problem with Dementia care. Unfortunately they have the right to refuse their meds, eating and bathing. I live in California and have learned that even if grandma and grandpa were in a Skilled Nursing Facility that they have the right to refuse these things and in some instances have more rights than you and I.
Now, on a legal note: Your mother needs to have at very least a Durable Power of Attorney and an Advanced Medical Directive that names you as the Attorney of fact, which will give you the legal powers to make decisions for her. I am at the point that I have to execute my powers of attorney of fact for the saftey and well being of my grandparents.
Let me leave you with a chuckle...
Last week I had to take all my grandparents credit cards away, because they were ordering things off of the television. As far as I know all they ordered were a set of Wolfgang Puck pots and pans when they have perfectly good pots and pans and they don't cook anymore. I'm waiting for the Alpaca crate to be delivered, as they did take down the phone number for Alpaca.
Two weeks ago Grandma went to the doctor to determine if she had an UTI (urinary tract infection) and she did, but when the doctor announced that she did Grandpa got mad and asked "Where on earth did you get a DUI?" "Where were you going?" "What were you thinking?"
Take Care of Yourself!!!