A young British girl named Madeleine McCann went missing at the age of three while her family was vacationing in Portugal in 2007 and her disappearance has remained a mystery ever since.

There is a young Polish woman named Julia Wandelt who claims to be the missing girl, and she attempted earlier this year to deliver a letter explaining her belief to McCann's parents and asked them to do a comparative DNA test with her, Radar Online reported.

However, investigators have dismissed Wandelt's insistent claim and have warned the woman to stay away from the still-grieving parents, who by all accounts just want to be left alone.

The letter to the parents

Radar Online published the alleged letter from Wandelt to Gerry and Kate McCann in which she introduced herself, begged them to read the entire message, and wrote, "I am writing this letter because I would like to ask you to agree to a genetic test comparing my DNA and yours. In this letter I would like to explain the reasons why I believe it is possible that I am your missing daughter."

Wandelt described how she came to believe that she was a victim of human trafficking when she was younger based on conversations with her Polish father and grandmother that seemed to rule out adoption and confirm her suspicions that she'd been sexually abused at a young age by her grandfather, who may have been involved in other child abductions.

She further outlined her belief that she bore a resemblance to Madeleine and how she'd made multiple attempts to contact them and convince various law enforcement agencies of her claim, to no avail, which prompted her to go public with her belief on social media to gain attention.

Wandelt also noted that her Polish family opposed doing any DNA tests, had no pictures of her mother's pregnancy or her early childhood, and pointed out that she had a different blood type from them. She wrote, "The only hope is you. Madeleine's parents."

She also shared a few vague supposed memories of the McCanns when she was a child and concluded, "I would like to ask you for a chance to prove to you who I really am. I know this may be very difficult for you, but believe me, it is not easy for me either. If you would like to meet, talk, and/or do a DNA test, then please get back to me."

Wandelt showed up at vigil service in May

The U.K.'s Daily Record reported in May that Gerry and Kate McCann skipped an annual vigil at their local church in Rothley, Leicestershire to mark the 17th anniversary of Madeleine's disappearance, and instead sent a statement to their family and friends who'd gathered together for the solemn occasion.

Also present at the vigil was Wandelt, who was not invited and has been dubbed a "Maddie faker," and she reportedly delivered the letter to the missing girl's aunt and made a public statement following the conclusion of the service.

"I am Madeleine McCann. I have never stopped believing it and I have come here because I want to ask Kate and Gerry to do a DNA test. They haven’t done one to prove I am not their daughter," she said, and added, "No, I am not crazy. I am not a liar."

Investigators have a theory; police warn Wandelt to stay away

According to the BBC, it was revealed this year that British police have spent an estimated £13.2 million investigating the McCann disappearance and, though the probe is still ongoing, have largely concluded that Madeleine was abducted and killed by a German man named Christian Brückner, who lived in Portugal for many years, including at the resort where the girl vanished, and is serving a prison sentence for an unrelated sexual assault conviction and stands accused of other similar crimes.

As for Wandelt, Radar Online reported that British police recently told her in a recorded phone call, "You are one of many hundreds of people who think they are Madeleine. You are not Kate and Gerry's daughter. We are extremely experienced. There is no evidence that you are Madeleine."

"It's pointless you making any more attempts to contact the British police," they added, and warned, "If you go to Leicester again and if you cause any harassment you could be arrested."