Firstly, FSMQ Additional Maths will be pointless as she's doing to AS. THe FSMQ content is just all of the 1st module with parts of C2, S1, M1 and D1, though minimal amounts of the applied modules. There's simply no point in her taking it, even for the UCAS points. Usually people take it before they do the A-Level if they do the GCSE early or finish it early and find it easy, not while they do the AS. And besides, as they have similar content I doubt it's possible to do both in the same sitting.