Thanks, Perlexed, I think you are right. She is such a hard-working eager pupil that she likes getting the answers right, and at school she usually does! The maths expected for the 11+ is considerably harder and I think its been a bit of a confidence knock.
Since going back to school in September she has a new Maths teacher at school that she doesn't like - she adored the last one so much; he was so great at building confidence and the children in his class actually enjoyed maths!
I have taken on board the comments about talking through the paper with her and seeing what methods she knows how to use. I also agree with your earlier comment, however, that it is much easier to do a whole page of one subject, starting with an example and getting more difficult. I think I will move away from these and use mixed papers more.