1. Make sure you are not putting too much food out at a time. When you go out to feed her, clean the old food out.
2. Have you tried white or yellow cake mix??? OMG! That stuff is great! 2 eggs, cake mix, with 2-3 cups of vegetable oil. THEY LOVE IT! AND it packs the pounds FAST. My son's York barrow did that about a week ago and we started mixing the cake mix everyday and the pig, not only got his appetite back BUT, the pig gained 23 pounds!
3. Pour a bottle of white Karo syrup over the feed. Pigs are picky eaters and if the feed has gotten wet, had flies on it, or sat in it's food bowl too long, they will not even TOUCH the feed. If, after you try this and she still isn't eating, I would talk to the local FFA instructor or local vet.