Well, when he put her in w/the buck, was she responsive? (did she lift her hind end to receive the buck?)
How old is the buck? Did your hubby check to make sure he, um, shot in the right place? My bucks are always so eager for the does they will try to do it on her head if I don't reach in and turn them around real quick.
Also, I personally wouldn't leave that doe in the bucks hutch for an hour. They are rabbits. It literally takes only a few seconds. The doe can get mad and turn around and kill the buck. At the very least, if you leave her in there for an hour, stay there and supervise.
When she gets close to what you think is her due date (like a week before), just watch her quietly. When she's lying down, watch her sides, right above (like towards her head above) her hind leg. Just watch for little kicks. Be sure to put a nesting box in for her on **day 27**, and some extra hay. She should start to carry it around and just be busy w/the hay in general if she's preggo.
Good luck!
We have a doe we've tried to breed 3 times. We give new does 3 chances to conceive before we butcher them. We have one now that will go in the freezer this weekend. She just isn't responsive to the bucks, and I'm not into forced breeding, although it can be done.