GM - school reports are a bit of a mystery to me I must admit. At the moment ours have current attainment, predicted attainment (ie if they carry on working as they are) and target attainment (what they're capable of).
My eldest is in Yr10 and I've just dug out his reports for last year. In December of Yr9 he had 5Cs for current and predicted attainment for French, same as your dd, but a 7 for target attainment. They were the same on his April report; but by the end of KS3 (a mere 2 or 3 months later...) he'd gone up to a level 6.
I have to say, French is his worst subject. He chose it as he has to do a language GCSE and that was the lesser evil. He resents having to do it immensely and puts zero effort in as far as I can see. Now he's in Yr10 his current attainment is a D, his predicted attainment is a C, but his target attainment is an A. I'm hoping he might split the difference and end up with a B! I try not to worry about it as it's just one subject, but it does infuriate me that he gets good grades in everything else but just refuses to put the effort in for languages.
Do you have a parents' evening coming up, or could you ring/email her language teacher to put your mind at rest?