Hi maisy moo, love the name! Setting the dementia aside for the moment, you've probably been running these conversational scripts in some form for many years. Remember, if you keep doing what you've always done, you'll always get what you've always got. If your mum has these sayings that reliably press the guilt button you need to find a way to disarm her!
Make a list of these teeth-gritting sayings of hers in one column, and next to each one write what you usually do or say. Then think of a new response to each one. It helps to imagine yourself as a stranger, hearing her comment for the first time. Here are some examples:
Mum: what a family I have! I have a rubbish family!
Potential responses:
Hard luck, we're the best you've got
You're lucky to have us
Nobody's perfect
Don't be so hard on yourself
Cheer up, you know we love you
I'm sure you can come up with better ones. Don't worry about annoying her, the whole point is to break the habit. A bit of sulking will give you a breather.
My mum used: I just can't understand why you won't/can't/don't to which I learned to respond: I know you don't or (very naughty) Try harder.
She also said: other people's children do/don't / are kinder, nicer / do what their mothers tell them........ to which I responded: oh yes? well that's other people's lives. I'm not them. If she reached the stage of shouting that I was hard, cold and a bad daughter I just said I was sorry she felt that way and we could speak again when she was feeling better.
It's not easy, but it feels good to take back the power and refuse to own the criticism. I realise that you may feel mean playing mind games with someone who may have dementia. However, you are already playing her game and it is unhealthy for all concerned. You and your husband have to be the grownups. Decline to accept your mum's status as matriarch, but continue to respect her as your mum, while requiring respect in your own right. When my mother said she'd talk to me any way she liked because "I'm you mother!" I said that respect needed to work both ways.
I can't say we ever totally resolved it. I remember one phone call ending with "How DARE you speak to me like that! I will not have you argue with me! I'm your MOTHER!" I said I was ending the call to allow her to calm down. She rang straight back and ranted to the answering machine. Then she rang my brother and sobbed about how horrible I had been. Then he rang to read our father's script which was "DO NOT upset your MOTHER - whatever you said you must apologise because mother MUST not be upset. And DO NOT do it again." I was 51 and the eldest child, but we were still playing all the old games where Mother's feelings and needs override those of anyone else and where little girls who are not obedient and compliant must be corrected.
This was in the 6 months after my father died when I felt I could at last speak my mind because she couldn't take it out on him any more if I thwarted her. Thereafter she developed sudden onset dementia and lost her power to manipulate me. She's now a pussycat as she doesn't know how to pick fights and doesn't want to. Who knew that could happen?