sounds as if they are doing completely different exam boards- old school and new school.
Triple science includes physics- that's why it's odd that you say they stopped teaching physics in order to do triple science.
Do you mean they started the GSCE triple science course in Year 9 - where she is now?
It still all sounds very odd and if she is upset about doing badly on 1 part of her tests this summer well she'll just have to suck that up and move on - it's no big deal and you ought not to make it into one.
well it's not an issue is it because the teachers will realise that she wasn't taught the content of the exam due to joining the school later in the year.
what you are saying is that she did some of year 10 physics (GCSE) at her old school, but she didn't cover the physics that was needed in yr 9 of her new school due to joining the school half way (?) through the year.
it's not a problem - her teachers will know this and make a judgement.
Maybe your job is to tell her to calm down! There is no need for panic She's come from another school, she has missed some work, this is nothing new or unusual. I've had a look at your back-posts and see where she is at school- from what I see she is at a very good school so I'm sure they will sort it out.
It's really not a huge issue so you need to try to tell her that and calm her down. I suspect she's more upset not to be 'top dog' any more in a different school.