Bright sunlight at midday is what helps reset the body clock - according to someone who has suffered through this for years. I tried it for myself and am happy to say that it helps. Can your DD go outside to the playground or some such place during her lunch hour? There is no guarantee that it would work, but, no harm in trying. Also cut out the electronics at 6:30pm or before that if her sleep time is 8:00 pm. Good luck.