NC for this. Yes, we went to school together and she was my maid of honour. We grew up in quite a deprived community.
She had a very disrupted childhood (no father on the scene and a half sibling by another man) and slept around a lot as a teenager/young adult, cheated on her husband before they were married.
No judgement from me, this is background which I think explains her behaviour.
She's very bright and subsequently moved to a different place, and had a respectable job in the health service. We were still within easy travelling distance of each other.
Then she reinvented herself and lived what I think of as an AA Milne / Enid Blyton atmosphere type of life - period house with antiques, going to the opera, cultivating friends who were doctors, name dropping.
When she had children, her mother cared for them and she encouraged her DC to call her mum 'nanny'. (We had an actual nanny for our DC - there was a definite aura of allowing people to think her mother was the paid help rather than this being a family title - 'nanny' isn't a usual GP title where we live, it would be Nanna or Nan).
Anyway, the social climbing is understandable, lots of people do it, I wouldn't describe myself as working class now even though those are my roots.
She started dropping off people in the social circle and they couldn't understand why. Then it happened to us.
What hurt the most was when DH's mother died in the hospital she worked in.
There were no condolences to us, especially DH. Instead, within hours of the death, she told people in the social circle whom she had kept ties with. (And they did send condolences and come to the funeral). I'm sure if we weren't so sad, we could have complained to the hospital about the breach of confidentiality.
We sometimes see her at social gatherings and you'd swear nothing was amiss, she seeks us out and sits with us. But there's never a follow up. I'm frosty with her now.
Very strange. I don't know if it's because I knew too much about her past or what.