My hamster is a brown bear hamster, and she has been in our family for about two years. She has been breathing heavier than usual, when she walks it is slower than usual, and she is not eating as much. I think she is sick and I don't know what to do for her. I have felt her body to see if she has any lumps, and I haven't felt any. She is also sleeping in different areas of her cage during the morning and afternoon. Which is unlike her, she usually sleeps during the day. Please tell me what I can do to make her more comfortable.    Thank you and looking forword to hearing from you.

Optional Information:
Age: 2; Female; Breed: hamster

Already Tried:
We bought her a knew cage and have been overwhelming her with attention.