I know it from both sides. My mum didn’t have any friends (she wasn’t very likeable) and would ring me up to moan about the world in general, anyone she came in contact with and most of all my siblings (my dad wasn’t around).
She did the same to me saying ‘you’re the only one who I can talk to’. I used to call her once a week, and she would moan for at least two hours at a time. So at least I didn’t have it daily like you do.
I am now doing it (sometimes) to my poor DD. I’m going through a divorce and after having therapy I am now reanalysing many things in my marriage. She would be my favourite person to talk to because there are certain things only she would understand. But I do know I shouldn’t do it.
Shehas told me bluntly she finds it hard, and I mostly respect that. I have badly let myself and her down on some occasions when I was really low. I take pride when we meet or talk on the phone and I manage not to say anything. It is hard because my sense of injustice against him is large and something I’m still processing.
Having therapy sessions does help. You say you have suggested counselling but she refuses. Perhaps you need to find a therapist for yourself to help you find ways to say no.
Would she even come to joint therapy with you? Perhaps she would then see the value and benefit of doing it alone.
If this isn’t feasible, I would suggest developing a long term strategy for reducing the number of phone calls and stopping the moaning about your dad. Maybe baby steps.
I tried competitive moaning, ie I started being very negative about everything hoping my mother would find me too boring and negative to want to talk to for long.
Perhaps every time she moans about your dad, you say you think they should divorce and immediately offer to look for a solicitor for her, look on right move etc. or do the opposite and start crying, please don’t get divorced, sob, sob.
At the end of the day you will have to be relentless and repetitive, saying the same phrase over and over again. Choose a phrase and keep on using it. @forrestgreen has some good suggestions.
You cant live your own life when she insists on sharing hers so much.
Can you say to her ‘mum you’re making me set myself on fire to keep you warm’