I have never gotten a rabbit spayed before because I have a male, but when we got our cats spayed it looked like that on most of them (they all ended up fine). We contacted the vet and they said that it was normal, but one of the cat's bellies started coming out of the incision and we sent her back to the vet to get restitched up. I think that your rabbit will be fine, but I would still call the vet just to be safe. How long has it been since her spay?