My 4 year old guinea pig is not eating her hay. I got afraid she wasn’t eating anything and then I gave her some grass as a test and she ate it. She is also still eating her veggies. So she is still eating, but I don’t want her to get used to grass or veggies since hay is better for them and that isn’t their normal diet. What should I do? Should I try getting a different type of hay? I don’t think this is a back molar problem like some other pigs have since she ate grass fine but I’m not sure.