Blanche pulls rose aside at the hospital and tells her she has been tested for HIV as well. Therefore rose should not have been shocked about the test taking three days because Blanche would have told her how long it took.
Rose tells the girls that she had difficulty sleeping the previous night and, as a result, went for a spin in her car to Tuscaloosa, Alabama. However, Rose could not have completed the trip overnight unless she caught a round trip, late-night flight from the local airport. By car, Miami, Florida, to Tuscaloosa, Alabama, is 780 miles or at least a minimum 12 hour journey one-way.