@Time2change2 No or extremely limited communication between pupils which is vital when you are starting a new big school on your own. How can you learn properly and communicate every day with peers and teachers? Get help when needed from the teacher in class? Feel at ease settling into a new school when you haven’t been in a school at all since March and had no transition or introductions to your new school of any kind?
You do realise that by being 'bubbled' and in a single set in year 7 she won't meet the range of children she normally would and communicate with them. She can't sit in grouped tables, but must stay side to side, like factory workers being back to back. She can't share equipment or move around the room. She probably will stay in one room all day with 30 others, who won't be allowed to walk around the corridors and get to learn their way around the building until this is over. They will have limited choices in the canteen and 'wet lunch' is a thing of the past - they'll stay out in the rain throughout winter, where transmission is lower.
The adults have to stay 2m away because there is no other way of avoiding transmission, so she won't be getting close contact help from the teacher; he or she will be standing at the front of the class. The teachers will only be able to give written feedback after exercise books have not been handled for a certain number of days, and your child will receive it days after it's written for the same reason.
It's not ideal, but these things have been chosen to be put in place by Headteachers for safety, so there we go.