I think this is what's happened.
Green bullshitted her way out of previous stuff as she was held in esteem as being an authority on what to do.
So she got away with the data breach. The stuff with their forum was explained away as just being the charity growing.
But the Cass Review highlighting the medical and ethical bullshit brings that into question. And thats coupled with major safeguarding fails which highlight problems are ongoing and Green wasnt properly doing things. The court case with the LGB Alliance is yet another example of poor judgment and decision making. Basically she was so far out of depth and unprofessional and could no longer be excused or justified. Especially with the charity commission breathing down their neck.
I suspect the 'Mermaids is under attack' campaign was the straw that broke the camels back and a row behind the trustees and Green over the safeguarding issue broke out. The Trustees wanted safeguarding matters resolving but Green responded by doubling down and saying there is no problem its just Mermaids being unfairly targeted. Because that's the only way she could cover for her lack of ability to do the job at that point. Susie was essentially getting paid a lot to fail to do the job required for a charity of Mermaids size.
It sounds like they are now looking for someone with plenty of experience in the charity sector willing to clean house - which will potentially include at least a partial reverse ferret. They want someone who knows what responsibilities come with the job and an income of that size.
But there are still plenty of fuck wits out their in the charity sector for whom this is still beyond but will fancy making a name for themselves with this one. Not realising the cash cow has been killed in the charity famine of the incoming winter of 2022/23.
Green got as far as she did by creating the fantasy of 'better a daughter than a dead son' and talking up suicide based on the issues within her own family which to any sane outsider look like a homophobic attitude used to convert a child who touched the wrong toys. Green was a fabulous saleswoman. She probably could sell ice to the inniut. And as such everything is explained on being trans with no consideration of another explanation. Hence Mermaids success. Its sales and marketing of an idea. Not duty of care and safeguarding of children.
That is until the Cass Review explicitly said it was an observation of a pattern that was happening - dubious parent child relationships which were trying to medicalise children because they didn't live up to parental expectations and desires or were otherwise victims of other trauma often sexual.
Whilst Green never made any secret of what she did, people excused it because to believe differently was to realise that someone was so open about her questionable actions to the point of pride and telling anyone who would listen. That's kinda incomprehensible to take in.
People tend to see the good in others and are trusting as a default. Especially the naive young of the left who have lived middle class lives untroubled by abuse or relative hardship.
It will be interesting to see how this pans out and what the background of the new CEO is...
The Trustees shit a brick as the penny dropped over everything...