NORTH PORT, Fla. - A woman who vanished after going on a cross-country trip with her boyfriend in a converted camper van is now the subject of a nationwide search after she didn’t return home.Gabrielle "Gabby" Petito, 22, was last in contact with her family in late August when she and Brian Laundrie were visiting Grand Teton National Park in Wyoming.Their social media posts documenting the trip abruptly stopped, and Laundrie returned to their Florida home in the van — alone, according to investigators.Laundrie has not cooperated with the police and is now considered a person of interest in the case, authorities say.Here’s a timeline of Gabby Petito’s disappearance: The couple embarks on their cross-country trip, first driving from Florida.