Is it a language thing, or is Spanish going OK?
Also have DD1 yr12 struggling with French, although the odd subject in her mix that she should probably not have taken. Sounds similar to your DD in being a last minute merchant too.
All subjects a larg step up, but being told by school languages especially massive. Seems 19/40 can give a B on a GCSE paper, whereas same mark would give E at AS. First mock had half the class getting U's (DD included) after just 6 weeks, but was a whole past paper. Have 3 more mocks, expected to progressively improve. Interestingly, little correlation between GCSE grades and mock score, as so different.
DD currently determined not to drop it early, but already decided its the one she will drop at AS. Biggest issue seems to be the grammar, which she got away with not learning for GCSE. So we have got her a French tutor in the hope she can salvage an AS grade.
I thought that although Uni offers were generally based on 3 A2 predicted grades, if predictions slightly below, the AS grade could swing an offer?
Does your DDs school offer EPQ in yr12? If so, could she bargain wih teachers to take this instead?