It's very important that your rabbit continue to eat, because otherwise, their gut goes to sleep (gut stasis), a condition which makes them very ill. If the rabbit hasn't eaten for 12 - 24 hours, contact a vet immediately. The latter can give an injection to stimulate the gut and keep it working. To reduce the risk of the rabbit refusing to eat, provide a hide with food inside and leave the rabbit in peace for hours at a time to help her feel safe enough to eat. Rabbits prefer to eat at dawn and dusk, so it also helps to have low lighting in the room where the hutch is.