Ugh, the more I read about AGY, the more I wonder. Some things that have been happening with her over the last month that weren't on my radar as being relevant are standing out now... Like her following Pepper around and begging to be fed all the time (which I noticed because of this high pitched beeping noise that accompanied it), and her hanging out at the door all the time and (essentially) 'begging' me for more food also (despite there always being food in the cage), and then eating ravenously and not stopping...
(And now I'm getting flashes of Storm's last week with end-stage renal failure, and that's really not what I need.)
It did look like Piper might have vomited again this morning, but her head didn't look as sticky as it has before. (I really dropped the ball on this by assuming it was from her constant feeding sessions with Pepper... The vet said he would probably have thought the same thing if he were me, though, until the other symptoms started.)
(I'm sure someone will tell me that kicking myself does no good. I know.. it's just my personality. Don't mind me.)