Teen always exhausted

Hello, 

Looking for advice or perhaps just sympathy. 

My teenager is currently not in school following a mental health crisis last year. She has some homework learning provision. She's often tired, and struggles to get out of the house, but this week seems completely exhausted and has hardly managed any school work. She's previously had blood tests and is under CAMHS for depression. 

I'm just so worried, every bad week is one week further behind. Her current plan is to sit GCSEs summer 2027, but she has missed so much. I'm worried about how it will affect her mental health if she doesn't sit them at the same time as her peers. I'm also struggling with the uncertainty of the situation (recently diagnosed ASD myself). 

Initially not being in school seemed to help and for a while she went to Explorers (Scouts) and we could go out at weekends as a family, but now she's back to too tired to do anything despite not being in school. Nothing seems to be helping and I don't know what to do.