The last message a desperate mother received from her missing 22-year-old daughter was just four words, a family attorney says: "No service in Yosemite." That message from Long Island native Gabby Petito's phone came on Aug. 30. And her mother, Nicole Schmidt, still doesn't even know for sure who texted it. Her daughter, the exuberant young blond woman from Long Island's Blue Point, vanished during a cross-country road trip with her fiancé, Brian Laundrie, at some point around the time the couple traveled through Wyoming's Grand Teton National Park as part of a months-long "van journey" adventure, Petito's family believes. Petito's family reported her missing on Saturday but they hadn't heard from her in three weeks, officials have said. The converted camper Petito and Laundrie had been traveling in returned to Florida, Laundrie apparently with it, two weeks ago.