Thanks, everyone. We'll get the bloodwork results back later today, however I think the antibiotics are helping. She's SO much perkier today - not quite playing yet, but she was meowing for me to get out of the shower this morning to give her treats, which is much more like her usual spunky self. I'm cautioiusly optimistic that it is a bug that needed something extra to kick it out of her system. We'll see.