Hi, I know you have been given some fantastic advice on this so mine will seem a little trivial perhaps but I work in a school and our school do actually cater for lunchtime detentions rather than after school detentions, this way it only inconveniences the child as she/he cannot go out and play with the other children. if you are going to meet with the school it could be a suggestion to them. Whatever happens, you sound like a great carer and I wish you and the family you are helping all the best and hope for a happy outcome.