Abby Sunderland's family was talking with U.S. and international governments about organizing a search of the remote ocean between southern Africa and Australia, family spokesman Christian Pinkston said.
Conditions can quickly become perilous for any sailor exposed to the elements in that part of the world.
"We've got to get a plane out there quick," said Pinkston, who was in close contact with Sunderland's family in Thousand Oaks.
"They are exhausting every resource to try to mobilize an air rescue including discussions with the U.S. State Department, the U.S. Coast Guard and various international rescue organizations," he said.
Abby last communicated with her family at 4 a.m. PDT and reported 30-foot swells but was not in distress, Pinkston said.
An hour later the family was notified that her emergency beacons had been activated, and there was no further communication. Pinkston said the beacons were manually activated.
Abby set sail from Los Angeles County's Marina del Rey in her 40-foot boat, Wild Eyes, on Jan. 23 in an attempt to become the youngest person to sail around the world alone without stopping. Her brother Zac briefly held the record at age 17.
Abby soon ran into equipment problems and had to stop for repairs. She gave up the goal of setting the record in April, but continued on.
On May 15, Australian 16-year-old Jessica Watson claimed the record after completing a 23,000-mile circumnavigation in 210 days.
Abby left Cape Town, South Africa, on May 21 and on Monday reached the halfway point of her voyage.
On Wednesday, she wrote in her log that it had been a rough few days with huge seas that had her boat "rolling around like crazy."
"I've been in some rough weather for awhile with winds steady at 40-45 knots with higher gusts," she wrote. "With that front passing, the conditions were lighter today. It was a nice day today with some lighter winds which gave me a chance to patch everything up. Wild Eyes was great through everything but after a day with over 50 knots at times, I had quite a bit of work to do."