Thanks everyone! And for those of you mentioning the nets, I had a very nice "Freedom Feeder" for her, and it sort of worked to slow her down BUT it was a pain for them to load and then I guess one morning the BO found her standing in her stall with her head tangled up in the net!!! So no more net, for obvious safety reasons!!
She is turned out during the day after the AM feed and brought back in around 3 or 4, depending. They go out every day unless the barn is having a show (once a month) or there are thunderstorms in the area. They have access to grass pastures while they're outside.
Oh and to address the ulcer question, the ulcers she had before were caused by foxtail in the crappy quality hay at our previous barn. Before then, she had NEVER had a problem with ulcers. Lately she has started to exhibit symptoms again (getting girthy - normally she is not at all girthy, she only started that after the foxtail incident) but I know the hay at this barn doesn't have foxtail in it, so an empty stomach is the only other thing I can think of.