In Tootsie's case, not much was going in....so not much was coming out.
(I think it was my fault, in that some of the greens I gave here may have soured a bit.)
Definitely good with the timothy hay and oats. In fact pellets should be okay, too....I would just limit them to prompt her to eat a bit more hay.
Parsley has always worked wonders for my buns as well. It will help prompt them to eat more.I give them a half a dozen sprigs of the flat kind. I do this until they start eating more normal amounts of regular food. Even a bun that isn't having any problems seems to chow down after eating some parsley.
~Jim