According to police records, 19-year-old Ashley Ramos, of Lahaina, was arrested on Wednesday afternoon on several charges including first-degree robbery, credit card theft, auto theft, terroristic threatening and kidnapping.
Her bail has has been set at $39,000.
Police say the visitors were at Nakalele Point just before 7 p.m. last Wednesday when they were approached by a masked man and woman brandishing firearms.
The 25-year-old man and his 25-year-old fiancee were held up a gunpoint, and their personal belongings — valued at more than $9,400 — were stolen.
The visitors were then separated. The man took the male visitor to his older model Chevy SUV, while the female victim was forced into her rental car.
They were driven to various areas, including the Longs Drugs in Wailuku, where they were forced to purchase cash cards totaling $1,300.
In surveillance video released by Maui police, a female suspect can be seen entering a Maui store with two other people -- believed to be the victims of the alleged crime -- before the group is seen again at the store's checkout line. The faces of the victims are obscured in the video.
The couple told police they didn't want to try to escape because they feared for their safety and their lives were threatened.
Eventually, the two were released with their rental vehicle. They called police after returning to their hotel.
The couple are students at the University of Southern California, and they've returned to school. They told Hawaii News Now that they're in shock over what happened.
Police are still searching for the male suspect in the case, who’s described as about 5-foot-11, in his 30s, and weighing about 180 pounds. He has short dark hair.