Twiglett - my mum sounds so like yours and we are also a family of just girls (only 3 of us though) which I think made it easier to be a friend instead of a mother. My father also worked overseas so for the latter part of my childhood when I was at boarding school and living in NI my mum was with us half terms/full time - so it was a bit 'all girls together' which was horrible as we had to support her.
She is still very selfish and even though she apologises for her bad mothering she usually blames my dad (they are now divorced).
I think my mum is jealous of my mothering tbh although she does compliment me I find it hard to accept them as I don't believe her. I also think she wishes she had boys and I am actually quite anxious about having a daughter in case I end up mothering her like my mother mothered me!
I don't really have a great relationship with my mum tho I don't think she feels the same. She does interfere and always wants to 'fix' things for you rather than just comfort you iykwim.
She also hates it when the 3 of us talk and she isn't involved or we feel we can't go out without including her which is really tough.
She also gives backhanded compliments - complimenting you whilst slagging your sister off. She was an only child which I also think had some bearing on her mothering skills and why she wants to be so involved with us as friends and not daughters. Now my grandparents are elderly she resents it and wants us to help out as if they were our parents which means we never get to have them as grandparents, and she moans about them and my father constantly - she lives an awful lot in the past tho she would deny it.
All in all its hard with her as a mum and I do tend to avoid her which is quite hard as she lives in my street!! Which is also why I want to move. My 2 sisters live in Australia and Edinburgh so they got away. Everyone else always thought and still does think my mum is great - no on e sees the other side to her. Since childhood we have called her 'the hostess with the mostest' because nothing was a problem to the outside world whilst we lived with her moods and unhappiness etc, but she never left my father which I think she should have done.
Sorry - thats turned into a novel - touched a raw nerve as I am sorting through family stuff at the moment finally!!