Originally Posted by SparksPirate
The grass is a lot longer than her old home, but her old owner said that she's brought her to new places with grass as long as mine, thrown her out there and she's done fine.
EVERY domestic animal has problems changing feed, every time. Dogs can have bleeding intestines from sudden changes. Horses can colic.
We don't have any pictures, but ONLY gradually changing hay, and gradually getting used to the grass on your property will guarantee no impactions, no colic, and no diarrhea.
I suggest you put her on grass hay ONLY. If you're getting a lot of rain you WILL colic or founder her on really lush, fast-growing hay.
I'm not familiar with the ulcers above and their symptoms, but OBVIOUSLY she isn't comfortable. Have your Vet out.