Daughter urgently in need of direction

If she wants admin work she might have more options in a college or university, simply as they have far more staff and openings than schools. Her best bet would be to find what agencies they use for temporary staff and register with them, that way she's not committing long term and can find out whether she likes it or not. She is unlikely to step into a senior support role but if she'd consider anything it may well lead to further opportunities.

Would she prefer to do teaching assistant work?
I know know a young man who changed to do that instead of teaching. He was just like your daughter but has started (last September) in this less taxing role and is enjoying life again.
His mother was very worried about him.

She was a primary school teacher.
Thinking about it, time flies, she has been teaching for 8 years. One year after uni doing her SCITT course whilst working as a classroom assistant. She has just spent two years teaching in Dubai. She did spend six months as an “office manager “ in a small business which she is emphasising in her job applications.

I can sympathise with her. I think a lot of teachers "burn out" and it isn't a new phenomenon.

Perhaps she could find a temporary, less stressful, job - even supermarket shelf-stacking - while she decides what to do. Or maybe do some supply teaching. At least she has the experience for that but wouldn't have all the admin stuff to do.

and the fact that she will not engage with a careers adviser suggests she might be depressed.
has she sought help from GP ?
or any self help support group.

frankly it sounds an unrealistic ambition at this stage.
how can she expect to step into such a senior role with no experience ?
she is trained for an entirely different role.
could she not try to use her qualification in a different way, eg as a private tutor/ governess, further training into educational psychology, school inspection, further education etc

What's her subject?

At 31, with only six years of teaching experience, what other work has she done?