Guinea pig has diarrhea : (

Going to the vet tomorrow because my guinea pig has been having some
problems with diarrhea and also pellets becoming stuck up her bottom.
She is also not eating very much and has become very skinny/bony. She
isn't squeaking much and is very quiet.

I'm really very worried about her, she is 7 years old but she's been
in good health for the last year. Any ideas what could be causing
this? She has had other health problems in the past and both times
they mentioned having her put down, but she recovered fully on both
occasions. I know she is a fighter and want her to live as long as
possible.

I hope she will be okay so please wish us luck for tomorrow.