Thanks for all your replies. I am fairly confident that she doesn't have Alzheimers or going through the menopause (she's been there and done that). She has been depressed for many, many years. But it is a self-obsessed depression. She has seen various counsellors and taken lots of anti-depressants, but whilst she expects lots of sympathy and support, she never makes any moves to help herself. I don't think she wants to be better and lead a normal life as then she won't be able to play the sympathy card with us.
I appreciate what you are saying JanZ about the letter, I know that I have to talk to my mum about this but I just don't know how to approach it. It's like walking on eggshells. I know that she is waiting for me to tell someone about the phone call she made to me, so that she can be all upset that I betrayed her confidence. That's why I've not told anyone, and besides I don't want to hurt my sisters by telling them what she said, they've enough to worry about at the moment. So this phone call has been preying on my mind every minute of every day, and I've not known who to talk to.
If I write her a letter, I know she will show everyone, and that's not what I want. I don't want the whole family to be dragged into this, she will make it into another 'family crisis' and it will be held up as another reason why we cause her so much trouble. If I phone her, again she will tell everyone that I have upset her (again) and that I said this and that, and how I have made her ill because she's so upset. That's what happened last time. I told her how I felt and how upset I was that not only was she not supporting my sisters, but that she had never supported me either. I got a lot of things off my chest and I thought the call ended amicably and that it was in confidence. But she told everyone her side of the story so before I knew it my brother pulled me to one side and severely berated me for upsetting her! He had me in tears, and I don't want that again.
I used to have an ok relationship with her. I could tell her about things that were happening in my life. I knew from the start that she wouldn't make much effort to get to know my dd, but I accepted that as the way it was. I am lucky that dh's parents are great with her and make up for any lack of attention from my mum. My sister used to gripe about my mum from time to time, she has never forgiven her for not supporting her, but I tried to keep my distance and accept mum as the way she was. But the phone call has changed all that, I have been dragged into the arena very reluctantly and I don't know how to get out of it. I am dreading talking to her, just the tone of her voice will grate on me, that sigh of despair that she does so well, the sniffle to tell me that I've upset her, the wobbly voice and so on. I don't want to lose my temper, but I just cannot stand any more of this.
One of you asked about my dad. They divorced 20 years ago and he lives in the Highlands now. They don't speak to each other at all. My mum has remarried and her life is quite nice, nothing much to complain about really. I don't get on with my stepdad but that's another story. I don't see what her problem is at all. She hates the attention being focused away from her, so maybe that's it. She can't stand the fact that my eldest sister is getting all this attention, rightly so, for her child, and she feels left out. I've noticed she always tends to bring the conversation back round to her, so if someone is going through a crisis, my mum will get involved so that we have to focus on her too. I think I am beginning to seriously dislike my mum.