Update on December 20th:
Mona has been having a rough time of it lately, with the heart murmur (recently diagnosed) and nowa bad knee that can't be operated on because of her age, Cushings & heart murmur. But there is some good news. The dogtur ran a yearly test when he found her knee problem (to monitor how her medication for the Cushings was working) and the results came back very good. The readings were better than last year. That's a blessing. Cushings is not curable but can be kept at bay.
She is in pain but the new medications seem to the helping a little. It just hurts to see her hopping around.