BOQUETE, Panama — Rescue workers struggled against heavy rains and high-altitude winds on a five-hour trek through rough mountain terrain today to rescue a 12-year-old U.S. girl who was the only survivor of a weekend plane crash.

Francesca Lewis was able to walk, but apparently suffered a broken arm and hypothermia, her mother, Valerie Lewis said in a telephone interview from Boquete, a resort village miles away from the crash site.

"My husband spoke to her by phone this morning," Lewis said. "She sounded good. She just said 'Hi, daddy. See you soon."'

Francesca was found walking near the wreckage of the plane at an altitude of some 3,500 feet on the jungle-covered flanks of the Baru volcano, about 270 miles west of the capital, Panama City, Lewis said.

The crash of the Cessna 172 on Sunday killed Francesca's friend Talia Klein, 13, Klein's father, Michael Klein, 37, of Santa Barbara, Calif., and Panamanian pilot Edwin Lasso, 23.

Michael Klein was the chief executive officer of Pacificor, a Santa Barbara-based company. He founded two companies in the 1990s before becoming president and CEO of eGroups, which was the world's largest group e-mail communication service. Yahoo purchased eGroups for $450 million in August 2000 and it is now known as Yahoo Groups.