How old is your cat? We had a young male, Max, diagnosed with it, they performed surgery to remove much of his colon (90%) and he had a happy, healthy 8 years thereafter- he couldn't take much water out of feces so he really loaded up a catbox but he was happy! It's not cheap but it sure did get him a happy life! Ask about this possibility- if she's not too old it might be a way to give her a real quality life-