whyever would you have to euthanize her?????
i'm extrememly confused here--i know people who regularly express bowels and bladders for their pets, and have done so for years.
it's terrible that she has suffered this trauma--yet another story to remind us all that it is NOT safe to let our cat children outdoors unless they are in an enclosed area, because it really is NOT safe out there--but to compound it by killing her?
if the vet involved can't teach you how to express her, you might want to find one who can! and if you're learning how to do the urinary bladder in school, read ahead a few chapters and you might find the next set of instructions.
or go to HP and ask the people who do this every day. HELP HER, for heaven's sake, don't abandon her again!
MC