You need to look at the following:
What she eats and drinks in the 2 hours before bed time, and cut out sugars, fizzy drinks, anything with additives/chocolate etc.
What she does in the 2 hours before bed time. Maybe she needs to have her story and winding down time before she goes up to bed.
You could try bathing her before her supper.
Try starting bed time earlier - if she is in reception she is probably way overtired and overstimulated. Starting bed time between 6 and 6.30 is what I would do.
Learn to give her a gentle massage using a mild lavender/calming preparation. There are plenty of books on the subject in the library.
Try music relaxation tapes, the sort used in hholistic therapy centres.
Routine is very important.
No rowdy play, no stimulating TV, no loud music or noise in the hour or so before you start the bed time routine.
You will need to stick with it and remain calm yourself.
Spend quality time with her when she comes home from school, so that she is not desperate to stay awake for your attention.
The worst thing for mine at that age was daddy appearing just as they were going to sleep. In the end I had to ask hime to come home later, once they were asleep, and just spend time with them at weekends - it was just winding everybody up too much.
HTH.