She won't eat hay

My chin doesn't eat any of her hay. All she does with it is pee on itwe
What should I do?

She has been losing some weight and I don't know why. I'm worried she us under weight. She currently weighs 370 grams.
Advice?

My chin barks at us . She does it when we take her out if her cage and even when we just stroke her lightly.
Shield I be worried?