My mum also has a mental illness. She is very immature also. I cannot have very meaningful conversations with her. She see's things in a very different way. She is sometimes like a little girl in the way she speaks and acts, the things she talks about. Right now I am feeling very angry at her, not that I would show it. Hope she is not angry with me tommorrow. I'm scared about having to see her.
She can't really help me. Maybe with some practical things but I would not open up and tell her about my pain and that sort of thing. She has no words to help me and I feel repulsive sharing private things with her.
But if she says something tommorrow about me not wanting to spend time with her today, I'll just be honest and tell her that I was sick. Maybe then she won't be grumpy. But I don't know, I hate telling her personal things.