Hello, I'm Dr. Kara. I have over 20 years of experience as a veterinarian and I'd like to help with your concerns about Kiki and the way that you lifted/caught her.
I don't think that you injured her at all and I bet she appreciates you catching her.
The good thing about the abdomen is that the contents move around easily and slip out of the way when pressure is applied. It is difficult to injure abdominal contents unless we have some sort of sharp, very fast, very forceful abdominal trauma such as falling a great distance onto something or being hit by a car. The urinary bladder is quite elastic and a healthy bladder is almost impossible to rupture without tremendous force, especially if it isn't full.
Your lifting her by her rear abdomen, though not especially comfortable, would not have been forceful enough to do her any harm. The fact that she is showing no signs of pain now, and she didn't cry out when she was lifted are both further evidence that no harm was done.
Rest assured your girl is fine and the only thing hurt is likely her pride.
Please let me know if you have any further questions.
Thank you so much! She had a Urinary tract infection a week and a half prior to her annual and had stopped eating until we treated it but was re-assessed on saturday and upon receiving the urinalysis results, I was given the ok to stop her Orbax as her infection had cleared up. She made me VERY nervous with that incident, so I'm a cat mom on edge! The peace of mind you have given me is much appreciated.