sounds like a serious case of stress colitis if all blood work came back fine
Is this the first time you left her this long?
when they get stressed their intestines inflame and if vomitting and diarrhea then the entire intestinal tract is inflamed
http://www.petplace.com/dogs/colitis-in-dogs/page1.aspx http://www.peteducation.com/article....2+2090&aid=249