The former flight attendant is reported to have fled the US with the help of Faye Yager, founder of shadowy organisation Children of the Underground, which helped women escape allegedly abusive relationships, The Australian reported.
Auckland midwife Geraldine Zulch told APNZ she met Barnett and Juan through mutual South African friends when she was using the alias Alex Geldenhuys in Mairangi Bay around 2002.
"We came to New Zealand [from South Africa] in 2001 and shortly after that a group of us met Alex and Juan.
"Our kids did a lot of swimming and a lot of surf lifesaving together.
"Honestly, she is an amazing woman. She was fantastic with those kids."
Samantha told Australia's Today Tonight programme last year that she stood by her mother's actions.
A petition published on the change.org website appealing for the US Attorney Office in Columbia to free Barnett has attracted more than 600 signatures to-date.
Barnett's next scheduled court appearance is on October 8.