World's most celebrated ex-hostage, home for the first time since her July rescue and embarking on a South America humanitarian mission, said Sunday that the brevity of her surprise Colombia visit owes to deep fears.

Ingrid Betancourt told The Associated Press that she is constantly revisiting in her mind her fateful February 2002 decision to rush recklessly into rebel-controlled territory unprotected — a move that led to her abduction and six years of captivity in Colombia's jungle.

Now, she doesn't appear in public without a detailed security plan. Death threats — which she wouldn't detail — and safety concerns prevented her from taking part in Friday's nationwide marches against kidnapping.

Instead, Betancourt arrived Saturday unannounced, met with President Alvaro Uribe and hostage relatives and briefed reporters on her plans this week to seek South American leaders' help in trying to secure freedom for Colombians still held captive by leftist rebels.

"For the children, it hurts immensely to imagine the possibility that the dream of happiness we are living might end — because it's fragile," Betancourt, 47, told the AP before departing for Ecuador.

Both her children, who call Paris home, reached adulthood during her captivity.

My daughter told me, 'Mami, I want you to be there when I get married. I want you to hold my baby when I have one,'" she said. The children lived abroad before: she sent them into exile with her first husband in the late 1990s when, as a crusading anti-corruption senator, she received death threats.

Betancourt, who travels with a French bodyguard detail, is now meticulous about security.

"When they tell me that I'm completely secure I say, 'OK, explain to me what is completely secure, what exactly is the plan, tell me exactly how many people there will be.' If there is a march, are they going to search the buildings where I'm going to march? Or I won't go," she said.

Betancourt planned to meet this week with the presidents of Ecuador, Brazil, Argentina, Chile, Bolivia and Peru and, hopefully, with President Hugo Chavez of Venezuela — though she said she is "neither a mediator nor a facilitator" and has no particular proposal.

"Contacts are frozen and a way has to be found to reach the FARC," she said of the leftist Revolutionary Armed Forces of Colombia, her former captors.

Betancourt told reporters Saturday that she was thrilled by U.S. President-elect Barack Obama's victory and has met with members of his transition team.

"I'm not sure that Obama knows much about Latin America," said the former presidential candidate, chuckling. "But I have the hope that President Obama meets in Latin America interlocutors who open his heart."

She said it was important that Washington maintain its close friendship with Colombia — Obama has expressed concerns about continued killings of union activists — because that sends an important message to the FARC.

She did not comment on whether she believes U.S. military aid should be continued at current levels. It has been key in putting the FARC on the defensive and contributed to her bloodless July 2 rescue along with three U.S. military contractors, when military intelligence agents duped their captors into airlifting them from the jungle in helicopters.

The FARC now holds 28 high-value hostages, including politicians, soldiers and police.

Betancourt delivered to Uribe a letter from Nicolas Sarkozy in which she said the French president vowed to continue efforts to secure hostage releases in Colombia — and to grant asylum to a rebel who risked his life escorting a hostage to freedom last month.

Betancourt said she hoped to fly back to France next weekend with the rebel, alias "Isaza," and his girlfriend.