She probably needs pain meds. Many bunnies need them, especially females. At this point, anything they gave her at the vet's office will have worn off. I would call the vet and ask for pain meds for her. I do not recommend using yogurt because it contains lactose, which rabbits cannot digest. It does contain beneficial bacteria for rabbits' GI systems, but you can get those bacteria in other products that do not also contain lactose. The best products are made for pets or horses and are probiotics that are lactose-free; you could also use human probiotics. If you end up force-feeding Critical Care, that has probiotics in it. I know in the UK something called FibrePlex is a good rabbit probiotic. I am not sure what is available where you are. The first priority, however, would be pain meds and water. Also, if you do get instructed to force feed her, make sure she is at an ok body temperature (100-103F). A cold rabbit indicates a body in shock (usually due to pain) and forcing food into a rabbit in shock will just stress the system more. They need to be warmed up, preferably at a vet's, and given fluids.