School - will anything work?

Hi. I'm not sure if there is an answer to this post but just wondered if i'm missing something because i'm too close to the situation. I have 2 autistic daughters, the 14 year old is just moving to specialist provision and really wants to get back to learning (I feel we're getting towards the end of a long battle and things are starting to get better). The 12 year old I can't see any solution for so am keen to hear any ideas. She is completely refusing school now. She almost certainly has ADHD too (hoping for assessment next month) and says she can't get anything out of lessons because she can't stand being in the same room as people, but she hates the thought of one to one tuition. She also finds it completely impossible to concentrate online. She sits in her room, doesn't want any social interaction with friends (she does have nice friends but never sees them now she's not attending school), anything I suggest outside of the home is 'awkward'. I feel I have a good understanding of autism (lots of training & experience etc) but I know everyone is different and I just don't know where to start to help her. Her school have been amazing, trying all sorts of things (unlike our experience with my other daughter!) but nothing is working. She cannot concentrate on even a single sentence so finds every single thing about her day impossible. Any ideas on how I can help her? We're not putting any pressure on and being very supportive but the more bored she gets, the more depressed I feel she becomes. She won;t let me help her with schoolwork either.