Rabbits are induced ovulators, they release eggs in response to being mounted by a buck. And supposedly they are receptive 17 out of 20 days. I've used Apple Cider Vinegar in the water (1 tablespoon to a gallon of water)for a week before breeding. It's not a scientific study, (I didn't run a control group) but only one doe missed out of 9 bred (3 different breeds).
If the doe is "lifting" when you run your hand down her back, she is very receptive. Some does will also flick their tails as they run around and "flirt" when they are receptive.
As Polly mentioned, swapping the doe into a bucks cage may encourage her too. And lots of breeders notice that a long car ride next to a buck will do it too... Take the doe to a show, just for the ride! The smells of all those rabbits might encourage her too.