Won't Eat Question about food

I adopted a pig 3 weeks ago. She is about 6 months old. The day after I got her, she showed signs of a mild URI. The vet put her on Baytril. I feed her Oxbow pellets. Before the medicine she would the lick the bowl clean. After about 3 doses of Baytril, she stopped eating. The vet told me to stop the medicine (her URI symptoms were gone but I was still worried about stopping the medicine) and give her critical care. Its been 3 full days since her last does of medicine. She is eating hay and drinking water. She has no interest in her pellets. She has also been eating her bedding. I give her Oxbow vitamin C tablets and she used to eat the entire thing, now she only nibbles on it. Any suggestions? I would like her to eat her pellets again. I took her back to the vet and she said she is very healthy (teeth are fine, no bloating, weight was back up) and to keep offering pellets. She also doesn't eat any fruits or veggies besides lettuce. (I don't think her previous owners ever fed her any)