This has been amazing. When I started the thread I had no idea it would run to so many pages. It's been quite cathartic reading all the replies and it's jogged so many memories for me that I now see in a new light. I'll share a few:
Firstly, one I remembered this morning, the utter abandonment of my dm driving away and leaving me when I was in labour. She'd been visiting for the weekend, I was due and I had those early, very light contractions. Whilst we were chatting at home, I stood rhythmically swaying - very gently - just to 'be' with it. Later on we went out to a favourite restaurant, 4 of us, me my dh, dm & step df. I was swaying gently in my chair the whole time by this point. She actually said 'I think the baby will be here very soon'. But after the meal she got up to drive home. I was incredulous and asked her to stay but no, she left. My contractions really ramped up within the next hour & my waters broke so we made our way to hospital. In the car I phoned her and begged her to return to help me through the birth. She said 'no' she had work the next day. If being there for your daughter giving birth isn't a cast-iron reason to bunk a day at work then I don't know what is.. Then the baby arrives next day & on the phone she says incredulously 'Oh, so she did come then!' (had a baby dd) Like I could have held it in for another few days 
When I was 16 she was having a clear-out and she gave me an old velvet purse full of Indian silver jewellery and a few rings. Someone in a previous generation had served over there. When I was 18 she took it back 'I think I'll have this, it belongs to me' - never saw it again.
When I got married my bridesmaid said to her 'What d'you think of oooz?' -in full wedding regalia. My dm moodily shrugged and said 'Well, it's not oooz is it?' My bridesmaid said 'What do you mean? No one looks like their ordinary self on their wedding day, after all, you wouldn't wear jeans & a t-shirt'. To which my dm said 'Don't see why not!' Utter bollocks. If I'd rocked up to church in a pair of old jeans & a t-shirt she'd have been aghast & in tears at the shame of it.
She regularly threw my toys away as a child and as I sit here thinking about it, I believe she purposefully made me look ugly to punish my father (who adored me). She gave me an army haircut where I'd had long hair and ribbons and made me wear these awful garish brown tartan trousers & turtle neck to match.
I remember my first student job. Working in a care home. I noticed after breakfast that there were so many tablets on the floor the elderly clearly weren't getting the benefit of the medication. So I went & told the manager and we made a list of what meds were found by which seats. She was very grateful. My dm stopped by to pick me up at the end of the day and the manager came over to praise me to my dm. 'She's the most conscientious student we've ever had here'. To which my dm replied 'Yes, she gets it from me'. No I fucking didn't.
It was always about what I could do for her. She was like a vacuum sucking everything in.