Is it worth getting a photocopy of the paper back first? If you do it now you get it back within a week /10 days - cost £10 or £11 roughly. Then you can see where she went wrong and decide if you think it is worth getting a remark. It is almost certainly the writing (I'm not familiar with your board so guessing). On one of the other current threads there is a discussion about whether native language skills are enough to do well in the exam.Personally I don't think they are in the writing and if they haven't fulfilled the other ciriteria for the writing such as content, variety, evaluation, essay structure etc they will come down heavily. That's my guess anyway.However so many people have been complaining about the marking of the essay that it is more than possible that she has been hard done by.