I took her to the vet yesterday to have some tests done. Blood work didn't show anything abnormal. They also did an ultra sound of her abdomen. That also did not show anything abnormal. They also did a urinalysis but I won't get the results of that for a few days.
Another update FYI....I just got word that the urinalysis turned up positive for an infection. They are going to do a another test to see what it is specifically. But it appears that an infection is the likely culprit. Very good news that I can attribute the problem to something which can be remedied rather easily.
Thank you. She is doing much better. Seems like her old self again.