It might be worthwhile to get her in to a vet that isn't very rabbit savvy--even a dog or cat vet can probably help in this situation. As long as you remember that some drugs aren't ok for bunnies (like oral penicillin, amoxicillin), the treatment of internal injuries of this sort probably would be the same for a cat or a rabbit. They're going to want to do x-rays and see if there's anything broken. They can determine what to do if something is broken.
It sounds like her intestines have been perforated by the injury, which is really bad and difficult to recover from. It may require surgery to repair the perforation. I would get her to a vet as soon as possible, even if it's not a very rabbit-savvy vet. I think a dog or cat vet could do this type of surgery. At the very least, the vet can take x-rays and determine the extent of the damage so you can figure out how to proceed. They can also have her put to sleep peacefully if that's the best option. It really depends on the extent of the damage and what the vet you find is comfortable doing to help.
Poor girlie. Good luck.
edit: wanted to add why it's so serious and important to get her in ASAP: the intestines are full of bacteria that can cause real damage if they are perforated. These bacteria can get into the body cavity, and then the blood (they're usually kept in the intestines by the intestinal lining). Then the rabbit can get a full-body infection, like sepsis, and that is extremely difficult to treat or recover from. When the intestines are leaking, you have to be very careful to keep a large-scale infection from overwhelming their body because the bacteria from inside the intestines have a chance to get into the rest of the body.
