The trouble is that stress can manifest itself physically, too. I have no idea whether that is contributing here, but DD2 was clearly physically ill in year 1, but also not coping emotionally. Her attendance was down to 79% before I removed her and changed schools. She managed 100% attendance at the next school, but only because once she fell apart, they withdrew her from afternoon classes for nurture group, and when that stopped, I withdrew her altogether and HE'd.
When she went to school 3, she managed pretty much 100% attendance, because it was a tiny school, so they could nurture her within the class. Now, at secondary, she gets through by having 2 sessions a day with the dog.
It's interesting, she said that she goes to the SN block to spend time there (she isn't classified as having SN, as she's too academically able, so doesn't get taught there) as she feels like she is more like the people who are taught there, and she fits in there. She feels like she should be there and should be taught there, so when she goes there, she feels like she's arrived 'home'.