Hi OP, I’ve been where you are now, and it’s really hard.
DD missed all of Y10 & Y11, felt unable to start college at 16. Now, a year later, she has started, and we are at 100% attendance .. the first time since Y8.
A few things I learned along the way … stop talking to her about school, she knows she is supposed to be in, and why. Talking about it will make her anxiety worse.
It’s not your job to her into school, that is the job of the professionals. Your “job” is to make her feel safe, loved, and enjoy her for who she is. School, Senco, CAMHS… keep batting it back to them.
You have to push & fight for everything … learn who to complain to, and how. My DDs anxiety was associated with undiagnosed Autism.. she is (recently) diagnosed. The big change for us was medication , she is now on Sertraline.
She’s not doing this “on purpose” so no amount of bribes or punishments will solve this.
…and the main thing …as a parent, stop worrying about attendance, exams and results. Education can be accessed at anytime, a young persons mental health is much more important. DD used her phone & computer to self-regulate & socialise … so I stopped “taking her electronics off her” (as many people will advise).