My 14 year old dd has always done very well at school, has friends, generally happy.
There has been some friendship drama this year which she's kept out of - it's just not her style. One of her longstanding friends abruptly switched friendship groups a few months ago and (I think to gain status in this new group) told them some unpleasant and untrue things about dd.
One of the girls in this group who dd describes as 'powerful' has got it in for her. There was a 'mediation meeting' between them a couple of months ago where they ageed to 'put things behind them'. I was a bit 
as to why mediation was considered the right approach as the only point of difference was that this girl wanted to make my dd's life miserable and my dd didn't want her to....
However, I didn't want to blow things out of proportion and just wanted things to settle down. This girl has continued with what the HoY described as 'micro-aggressions' towards my dd eg staring at her, talking with her friends about her and laughing. All standard 14 year old stuff, which dd has been trying to ignore, but it's really got to her now.
She refused to go to school Tuesday and Wednesday. I spoke with her tutor and HoY - the other girls parents were spoken to, the other girl was spoken to etc.
Dd came home today in tears saying that no-one said anything but she felt really stressed and doesn't want to go back to school. At the moment, she's saying that she doesn't want to go to any school which isn't an option. She's generally very resilient and level headed about things, certainly a tendency to be highly strung but much, much less than when she was younger.
I have no idea whether I'll be able to get her there tomorrow and I'm beyond stressed with this, my elderly mother being very needy, my own work stresses and the ongoing strains of the pandemic. My mental health hasn't been great for some months, which I'm receiving treatment for and have been protecting my children from.
What to do? Do I apply for other schools? She won't be able to do at least one of her options anywhere else, but she says that she doesn't mind this. Given the timing, she may have very limited choice about options which she's saying that she doesn't care about but may feel very differently when faced with a timetable that she doesn't want come September.
Has anyone been in this situation? What has helped?
This time last week, even at the weekend, I would have said that dd was a pretty happy, stable 14 year old and had no major worries.
Now it feels that she's spiralling into some sort of mental health crisis and on the verge of becoming a school refuser.
Any words of advice? - I'm feeling completely out of my depth.
TIA