I'm sure as everyone had suggested, once you explain everything it should be ok. It would have been slightly more problematic if the CAF had been delayed or you had missed out this school. Good luck.
Hi Wanting the best
I am confused. Newstead requires a SIF but that was due in July 2012 for Sept 2013 entry. The SIF had to be completed before the girls sat the Newstead exams
Dippybaby, the OP meant, I think, that she hasn't sent in the SIF for a Kent school. She has done so for Newstead. The reason she got confused was that the CAF she filled only showed up Newstead as requiring a SIF and not the Kent school. This is why, with everything else, she didn't check if the other schools on her CAF needed a SIF.