Thanks for the responses!

I don't think it's pain in her body or mouth since she runs around full speed without any problems and she eats without issues. I'm beginning to think it might be that she needs a dental. Her teeth are horrible. So as soon as I save up some money I will take her in for a dental. I've been putting it off because I didn't want her to be put under, but it's getting to the point that it is necessary.

Any other ideas are welcome though. And I will still keep in mind the mouth and body pain as well. And watch out for any signs.