It sounds like the start of GI stasis. I would stop all treats and pellets, nothing with carbs, starch, or sugar, and feed only grass hay, and her usual leafy greens are probably ok too. Hopfully that will keep her from developing a blockage. Did the vet also give you probiotics with the baytril? The baytril is probably what has messed her digestion up. I will usually gradually introduce the probiotic in really small amounts at first, as I've had it cause a gut slowdown with some of my rabbits. You'll need to keep an eye on her poop and eating, to make sure either one doesn't stop. If she keeps eating and her poops get back to normal size and amount right away, then you may not need a vet visit, but she has a bacteria build up, and depending on the type, she may need a different type of med to get it under control, which would take a vet visit. If you are concerned, then it might be best to get her into the vet.