Need some advice

[anxiouspomegranate]

I am struggling a bit as a parent and would appreciate some advice and support please.
2 of my daughters 13 & 14) are diagnosed with ASD.

The eldest one is doing ok. She keeps to herself but is doing well in studies. She sometimes misses classes but never skips school.

I’m worried about the 13 year old. She is extremely sensitive and doesn’t like to interact much. She doesn’t like to become the centre of attention. She is fine at home but if something happens at school she will refuse to go in.
She’d missed all classes this week due to something that happened last week at school. From what we were told she was in a class with a new teacher. She was asked to stop what she was doing by the teacher in a way that made her the centre of attention in the class, with other classmates started laughing at her.

We have SENCO support at school and pre COVID had a few visits to diagnose her condition and plan for support. However due to COVID this has been put on hold.
The lockdown did make it harder for us as she got used to being at home.

She enjoys computer animation and spends a lot of time at home doing this or drawing abs reading books about animation.
I’m worried about her missing school. We’ve tried talking to her but she just shuts down. She tends to avoid conversations that she doesn’t want to participate in, both at home and in school.

We are worried that the school would suggest sending her to special needs school as that would mean she would be on her own (she currently goes to same school as the 14 year old), in a school that is further away.

This has become apparent when she became a teenager. She never seem to have any issues in primary school.

Just wondering what we can do to support her.
Apologies if this isn’t posted in the right forum.
We are very worried and distressed and would appreciate any advice.