sophie has diarrhea

for at least the week one of my kitties has been having diarrhea and i just figured out who it is, sophie, who i suspected. i've been trying to get a fecal sample on her anyway, and i finally "caught" her pooping today. so off the sample went to the vet. she is going to be there next week anyway for another shot. i think it is because of stress, hopefully. she isn't dehydrated, her skin bounced right back if i pull on it. her belly isn't swollen either. she is about 3 1/2 months old and has been dewormed 3 times, most recently a couple of weeks ago.