Not enough was said for any conclusions to be drawn. It looks equally possible that she suffered from mental illness and perhaps was not rational. That would call into question statements about alleged gangsters. I've never heard of Chinese gangs being involved in any major sex trafficking in Thailand, not that they aren't, but I hear other countries mentioned more often. The few facts and statements including an American benefactor as well as an employee who said she jumped make it look more like a suicide. No one saw any such suspicious person around the victim. She could have fabricated the story about the Chinese as a way to get help and attention. Not unusual for mental illness sufferers. The story she told the police very likely lacked credibility. But no one can say for now.
