Hey lovely - I went through similar with my daughter who was later diagnosed with ASD. She too sailed through primary or so I thought, there were signs back then now I look but she was a master masker and primary school was so small and nurturing that she was able to cope with her ASD. Trouble started at secondary school, everything fell away. She was so sad, struggled with her identity, refused school pushed me away.
But we got through it, and she is a phenomenal human now. She never went back to school fulltime, attendence in year 11 was 23 percent. School crushed her, and caused her overwhelming anxiety and burn out. But instead of pushing her we supported her, and slowly but surely she came back to us. The school allowed her to study from home (I don’t think this is common, we were lucky) but she is so bright they wanted her grades I think. She came out with 8 GCSEs all 7s , 8s and 9s.
she is at collage now, has a great group of friends, she gets burn out still but we know the signs and it’s not personal it’s just she need time and space out. I remember in the thick of it that felt rude at times especially to my husband (he took longer to get it) but we reframed it and now when she takes her self to her room without engaging with the family after a long day, we know she is just burnt out. I have a routine now where I come in from work and go straight to her, we sit on her bed and chat and have a check in. There is no pressure.
She is genuinely, happy and thriving and copes having ASD. She wants to go to uni, she has hobby’s and a lovely boyfriend. She can’t do everything others do all the time and knows her limits. I think this is sometimes the issue, they know they struggle, they try and fit in, but can’t cope with all that the life of teenager is. She needs to understand her self more and like her self. I remember my daughter breaking down one day and saying she doesn’t fit, doesn’t feel normal and doesn’t understand why as she is trying so she hard to. She knew she was different but we didn’t have the answers. I think the ASD diagnosis really helped her, like a light bulb moment where she finally understood and instead of fighting it she embraced it and it all fell into place for her.
What I did, listened, listened hard. Loved her, guided her but didn’t push. Home schooled for a while, she asked we listened her mental health was rock bottom at this point - , we gave conditions though out of love - she had to study properly, had to get up in the mornings and had to join two activities (this is really important I think). She did all this, and then after a year she asked to try school again. We reenrolled her, it started well and she went in regularly (struggled to cope in year 11 with the pressure of it all and mostly studied from home), it was hard but it was her choice to try and I’m glad she did as she was able to sit her GCSEs. We had a supportive school though, so were lucky there. She was under CAMHS but they didn’t do a lot due to wait lists but it gave us a safety net where the school Listened -and before her official diagnosis they wrote a letter saying they suspect ASD and she is to be treated at school that she does. You have to fight it wasn’t easy but we got there and I am so proud of her, we are closer than ever now but there was a time where i felt her slipping away and pushing from me.
good luck OP you’ve both got this.