Hi - I have had four of my girls farrow February/March and one of them, Mary did not eat two of her meals, even though I enticed her with several of her favourite tit bits. I have a rule that if any of my pigs miss two meals and is not drinking, I call the vet. I checked her temperature and it was high, so immediately called the vet, who came within the hour and said it was farrowing fever and antibiotics were given. Within 24 hrs she was up on her feet and feeding, so your vet should be called.
Tess