I see your point dancelady to a degree, i too have a disorder and i do find it extremely difficult to maintain relationships however it has improved between my self and my mother. I personslly am not wanting relationships with friends or a boyfriend as my previous experiences have been too painful and at least for the time being i dont want to persue this but i do finally have a good relationship with my mother.
By no means do i think its simple and can be solved easily. It was only suggestions i offered which have helped for me in the past to some extent.
I have learnt to love my self a little well my inner child at least and i feel more comfortable to be on my own, mostly but not completely. Everybody needs the love of someone weather it be a friend, a parent, a partner. For me i have my mum and my children which i am really lucky to have. Everyone needs a little hope ir they will give up. Maybe and hopefully she will find someone and i wasnt trying to give a list of instructions just suggestions which she can choose to ignore if she wants. But i really do believe there is hope for everyone. Not saying things will drastically change but something positive could happen.