The 1:1 ranking is very good - how many did the Head rank in each of 1,2 and 3 out of the 12?
The school's pass rate is not great, but there's nothing you can do about that. Presumably the class is around 30 children? In which case the Head only putting 12 on the OoS would seem sensible.
The disruption before the test is certainly worth a mention, but presumably it was only one test that was affected. (However, one could argue that it would have been the one she passed, if it hadn't been for the rocky start.) Don't overdo it though - just a mention, and let the panel ask you questions.
Have you submitted the letter from the tutor already? Generally panels will ignore references to tutoring. It won't harm your case, but I suggest just saying that she was doing well in practice before the test and not mentioning the tutor again.
The practice papers are also not really relevant, as the same papers are used every year and the children could have seen them beforehand. However, I would mention the scores briefly as they are really all that you have on that front.
Take in her school books and reports, especially anything that really stands out, and concentrate on finding every scrap of solid academic evidence. Do they have sets for English and Maths? Is she on extension work in Maths? Has she won any school prizes for her academic work? Any musical talent with exam certificates to prove it?
It might be worth an appointment with the class teacher to check for any nuggets that you have missed. (Mind you, as she's a girl she probably tells you most things about school anyway.