When I first got Chewy, (she was flown to me also), she was SO shy and hid under the kitchen table for DAYS! I felt so bad and kept calling the breeder etc... She came around though, was prolly just scared from the plane ride then being in a new environment with new people... The bloody stool could be a problem though. My dogs have had that before and I think it's Giardia or something? They had to take meds to get better. I'd take her to the vet to get tested and see, but she'll be fine. And she'll definitely be vocal before you know it