Have you spoken to the school about what they could do to help her out? Have you thought about changing her school? If she had been home-schooled for some time it would be easier to get her through her GCSEs but you will be learning the system, finding resources, etc so I would be concerned about her being up to GCSE standard by the time she should sit her exams. We home-schooled one of our children for 2 1/2 terms but he was only in year 2 at the time so it was a whole different ball game.