Once the problem is identified and solved your rabbit should begin to eat on her own again.
Rabbit's have very sensitive teeth and if your rabbits teeth are bad enough to have a loose molar it may be necessary to extract that molar and perform a necessary dental prophylaxis.
The gas anesthetics, Isoflurane or Sevoflurane, are very safe and short acting. Your vet should be able to maintain anesthesia on your rabbit long enough to perform a complete oral exam, extract the loose molar, and perform necessary maintenance on the teeth safely. If there is any question of safety due to electrolyte imbalances, other blood abnormalities, or dehydration, than your vet can perform pre-anesthetic blood work and place a catheter to supple fluids prior to anesthesia, during, and after anesthesia if necessary. If your vet doesn't routinely perform these procedures on rabbits perhaps he/she can refer you and your rabbit to a veterinarian who specializes in exotic species.
Another cause of the behavior you describe is a trichobezoar (hairball) causing a stomach impaction. Hairballs are very difficult to see on X-Ray because they resemble food on an X-Ray.
Additionally most veterinary schools have an exotic specialist on staff and it would be worth your while to make inquiries at a veterinary school near you.
Thank you for your advice. This is precisely what I am doing right now. She will be at the vet's this afternoon who is not herself a specialist in tooth extraction, but she will examine her and file her teeth if there are any hooks and she will check the molar to see if it is indeed loose. If so, then I have already secured a slot with a specialist early next week who can extract it.
Is it your experience that after three weeks of forcefeeding, rabbits do quickly settle back to eating by themselves??
Thanks again - really great to hear I am doing the right things and that I can hopefully help her through this...
You might try feeding her something that contains wetness, like fruits and veggies that taste good and are not harmful to the rabbit. The rabbit may be craving a different diet or just be tired of her food. This could be something wrong with the stomach, or just personality. I wouls still get a doctors oppinion just to be safe.