I helped out a fellow Mum who'd been out of the workplace for years. She brought her kids to the playscheme I'm chair of. She'd been a parent helper on a few occasions, but she said she lacked confidence due to escaping a DV situation.
Over a year or so I helped her build her confidence. I found funding for training to help her confidence and CV. I dropped her and her two kids home every day. Not just me, the vice-chair spent a lot of time helping her out with all sorts of things, they seemed to become great friends.
Then she did something that breached our policies. Nothing major, but could have been problematic so we had to have a chat with her. It was all very friendly. Just a "Look you did X and you can't do that because of Y and Z reasons." Nothing OTT.
She stormed out in tears, slated us all on social media, slashed my car tyres (though I can't prove it was her, only my car in the middle of a busy car park was touched) and screamed at vice-chair in the street.
Worst of all she went round some parents who sent their kids to us and told them horrible stories about how poorly we looked after their children. She turned up at our AGM with a couple of them who'd been taken in by her. Someone contacted OFSTED with a major safeguarding concern so we got an unexpected visit.
It damaged our reputation for two years until she did the same to the Brownie leader who went through the same.