I've read that low starch feeds are much better for keeping stomach issues at bay, especially when coupled with lots of pasture time.
So far, I've come across two possible feeds.
Triple Crown Low Starch Horse Feed-
Low Starch Horse Feed-Triple Crown's Low Starch Horse Feed Formula
Purina Horse Feeds - WELLSOLVE
I'm just wondering if any diet experts have better ideas on what to possibly feed her.