Interesting! Usually it’s the opposite problem! Since hay is really the most important thing, I wouldn’t worry terribly. You can try giving a wider variety of hays to make sure she’s getting some additional minerals. You might also try offering dried veggies or herbs to see if she will like those, I know some people have good success with dried dandelion.
Buns are often reluctant to try new things at first, so I think the best thing is just to keep offering the foods. She might only nibble for a while, but then will develop a taste for it.
Have you had her teeth checked? Usually dental problems cause less hay eating, but occasionally the bun will get picky about other foods instead.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.