The mother of a 17-year-old girl who has been missing for more than a month and is believed to have been kidnapped into the sex slave has made an emotional plea to get her daughter back.

Sarah Dunsey, from Utah, was last seen at the MGM Grand in Las Vegas on January 15. Her parents believe: 'she is being held against her will and is a victim of sex trafficking.'

Amie Dunsey, Sarah's mom, starred in a heartfelt video calling on people to come forward to help bring her daughter home.

'January 15 our daughter Sarah Dunsey was abducted from Las Vegas, Nevada; she's being held against her will and Sarah is a victim of sex trafficking,' she said to the camera, as Sarah's father, as well as a host of relatives and family friends, are stood behind her.

Sarah Dunsey (right), from Utah, was last seen at the MGM Grand in Las Vegas on January 15. Her mother (left) has made a desperate plea to get her daughter back

'I cannot wonder where she is and if she is safe. Please help us find her,' Amie Dunsey (pictured), Sarah's mom, said

'This is my absolute worst nightmare. We need Sarah home.

'I cannot wonder where she is and if she is safe. Please help us find her.

'Sarah… this message is for you: I want you to fight. Because I need you, all of us need you. The world needs you, so fight.

'We are coming to get you.'

Amie is also seen writing out on a piece of paper what the family claims was the last text message they received from Sarah - who went to Las Vegas on a trip with a group of friends.

Sarah (pictured) had traveled to Las Vegas with a large group of friends for a trip when she went missing

'This is my absolute worst nightmare. We need Sarah (right) home,' her mom (middle) said

The haunting message read: 'If I die tonight it's a guy named.'

The text included the name of the person mentioned, but it was redacted from the video. The Dunseys say they did so because they do not want to tip off the person who they believe took her.

Sarah's aunt, Leah Hullinger, told PIX11 the family is doing all they can to bring her home - but concerns grow with each day she remains missing.

'All of this information is pointing to Sarah being held against her will and being trafficked and exploited,' Hullinger said

Sarah's family said this is the last text message they received from her before she disappeared

Sarah's mother and father are seen in this emotional video where they made a plea to have their daughter returned home

'Some days we feel like we're close to finding her, and other days it just feels so overwhelming and so vast.

'To know she's being beaten, is being hurt and held against her will (is too much to bear).'

Hullinger closed her comments by saying the family knows it is a long shot, but they all desperately hope the new video reaches Sarah.

'This lifeline to her family so she knows, don't let them strip you of your identity and how you are, and everything that you are: Don't let them do that to you,' she said.

The family has not explained why they believe Sarah has being trafficked.

Sarah is described as being five-feet two-inches tall and weighing 130 pounds. She has brown eyes, brown hair and a distinctive tattoo of a lotus flower on her ribcage.