CB, it's good to see you again. Sorry about your daughter.
I never brought this up partly because with all the other stuff 36 has done, this was mild, but 36 would refuse to go to school in high school. He faked sickness too. He was way too big for me to make go to school and I was divorced and a bit afraid of him. So if he didn't go, he didn't go. The principal wanted him to graduate. He bargained with him that he didn't have to take gym the last year if he'd get his diploma. difficult child hated gym, and he did get his diploma. He was extremely smart, but had and still has severe anxiety disorder plus he hated school. I was working full time and had bills to worry about, The school never called the truancy officers on him. He'd go just enough to not get into trouble, but never got the grades he could have. He refused to go to his graduation too. I don't think he ever did his homework. He locked himself in his room almost 100% of the time and I had no idea what he did and he would not come out. His father was wussy (still is) and when I called him for help, he was useless and difficult child didn't listen to him. So his entire high school years were a waste. Bribing didn't even help (yes, ex tried that with my approval).
Nothing could make him go. Sometimes he'd go and I'd come home from work for lunch and he'd be sitting in front of the TV. He walked out. "I felt sick." Again, I was afraid of him a little. He was big, strong and threatening and I had no way to get him to go to school.
I'm sorry you are going through the same thing. Seems like both difficult children have that school anxiety. In difficult child's case (mine) he was terrified to talk in front of his classmates. Funny, he was a bully at home.