Omg, you poor things - what a disaster on that first leg, I would've just died too....hearing that diarrhea going on
! That'd be awful.
So glad the return home went so great though! Makes one wonder what was going on w/ her tummy on that first day...like did she eat something, or get a virus/tummy bug...or was it nerves...?
You could also try (instead of Benadryl) acepromazine from the vet...it's a tranquilizer used for animals when traveling and may work better for you. Might be worth a try? Or calming sprays (aromatherapy) or pheromone sprays? A warming pad?