October 20, 2016 05:00 PM

More than 200 people were arrested and more than 80 juveniles were rescued across the country in a recent nationwide sex trafficking sting led by the FBI.

Heartbreakingly, rescuers came too late for one victim, a 14-year-old girl in Orlando, Florida, who authorities say died from a drug overdose after she was made to ingest Xanax and cold medicine while forced into prostitution.

Her four alleged traffickers are in police custody: Two were arrested in Florida, one in August and another earlier this month. The final two suspects were taken into custody on Monday in Atlanta. They allegedly fled to avoid capture in Florida, but got caught up in the FBI’s sex trafficking operation, dubbed Cross Country X.

“They knew that they had teen girls,” the victim’s mother tells PEOPLE in an exclusive interview. “Their intent was to traffic both of my daughters.”

(PEOPLE does not identify underage victims of sex crimes, and has declined to identify the victim’s mother to preserve her anonymity.)

Orlando Police Department
Orlando Police Department

Authorities say their investigation revealed that, via a friend, the victim and her 15-year-old sister had allegedly been lured into a sex trafficking ring operated by by 20-year-old Karla Michelle Quiros Alsina and three others: Arthur Lee Coleman III, 26, Avorice Jeno Holman, 19, and Jose Ignacia Santiago-Sotomayor, 22.

Authorities allege the trafficking took place between Aug. 8 and Aug. 14, according to arrest warrants obtained by PEOPLE. According to the warrants and the girls’ family, they spent almost all of that time with the suspects.

Orlando Police Department
Orlando Police Department

Orlando police allege the sisters were forced “to participate in the commercial sex trade” and “the victims were shown firearms and received threats of killing anyone who interfered with the sex trade.”

The foursome allegedly advertised the 14-year-old victim on Backpage.com, and Alsina allegedly drove her to multiple appointments with men who paid to have sex with her.

The girls told the mother that they were spending days and nights with a friend, and they kept in touch with her in calls and texts, saying they were okay. Their mother believed the girls were simply enjoying themselves in the final days before school started back.

Orlando Police Department
Orlando Police Department

Holman and Santiago-Sotomayor were arrested in earlier this month in Florida. Alsina and Coleman were taken into custody Monday in Atlanta as part of Operation Cross Country X.

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All four are held without bond at the Orange County jail. They are each charged with first-degree murder, human trafficking of a child and racketeering, among other charges.

It appears Holman has not retained an attorney, and Santiago-Sotomayor’s attorney could not immediately be reached for comment. It is unclear if Alsina or Coleman have retained attorneys, or if any of the four have entered pleas.

The warrants show that over the course of the investigation, police gathered sworn statements, surveillance video, phone records, text messages and electronic device download data – all detailed in a 732-page affidavit which has not yet been made public in its entirety.

On Aug. 14, the 14-year-old was taken to Orlando Regional Medical Center in a car driven by Alsina. The pair arrived at 11:48 a.m. The girl was dead in the backseat.

Investigators with Orlando police say she died from an overdose of multiple drugs, including Xanax and the cold medicine dextromethorphan.

Police tell PEOPLE Alsina was questioned for several hours but released, as the case had not yet been ruled a homicide.

Orlando Police Department
Orlando Police Department

“Everyone involved in the conspiracy to commit these crimes, regardless of their level of participation in the organization will be charged with first-degree murder and is responsible for [the 14-year-old’s] death,” Orlando Police Chief John Mina said at a news conference earlier this month.

Her older sister returned to her family when her mother and a friend sent an Uber driver to pick her up from the suspects’ home the morning of the 14-year-old’s death.

Her family tells PEOPLE she is back home and back in school, though she’s under police protection. The school has to let police know she’s arrived safely each morning and her mother has to let them know when she gets home. She is also getting counseling by a sexual trauma specialist and a child psychiatrist.

“There’s no amount of jail time, no amount of punishment that will ever give me peace of mind,” the girls’ mother tells PEOPLE.

“Justice being served is a good thing, but it won’t give me my daughter back.”

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