Hi again all, update here. Sorry if I forget to answer any questions
@Phil Anne Throw Pee - she's moving from non-profit into a company, so the salary increase is partly due to that and partly due to it being a promotion. In terms of the references, she had to complete quite a technical test as part of the interview process and they were pleased with it. She had been honest with HR about offering the extended notice period but that her boss might react quite negatively to her resignation, so they knew from the beginning she was leaving due to management. When she offered a reference they said they understand her current situation re: boss, so they won't ask for that and also know that you never give bad contacts for former references, so it isn't needed. They have a very firm induction plan and all seems green there I believe. Or at least I'm hoping so!
@dinosaursideways she retracted her offer to work an extended notice period after consulting her colleagues, telling them the situation, and them telling her to put herself first and tell boss to bugger off. Her new job are taking her three weeks earlier now.
Unfortunately the situation has soured in the meantime. Despite her boss still being on annual leave, he then emailed most of what he said to her over the phone - and CC'd in the entire board and all management. He has threatened to dismiss her for gross misconduct if she continues to 'complain'.
She then found out that her boss wrote an email to everyone in the organisation apart from her, saying that he's glad such a toxic person is leaving, that he knows everyone in the office hates her and feels she's a burden and if anyone feels their mental health has been ruined by her, they can come to him. Colleagues have scheduled a meeting with HR to complain about this and are devastated on her behalf, and have made it clear to her they don't feel that way at all.
She's just so young - I feel when you're old like me you know yourself and your work and can see these idiots for what they are, but this is really impacting not only her self-perception but now her anxiety levels. As a mum I just want to shield her from it.