I am sorry this is happening to you. It sounds like a rough situation.

My own mother refused to acknowledge I had mental health issues. My thinking about this was that by doing so, it would have meant admitting not all was perfect in the world of misguided perfection she desperately tried to make everyone think it was. She took my mental health situation personally as though it was some slight against her. In reality, I am sure she was hiding her own mental health problems. Does any of this sound familiar? I too have a siblng who was doted on as perfect.

Is there a father figure in your life? Is it possible to lean on him at all? Could he act as a go-between for you and your mother?

Is there someone who could be her proxy at the session?