Madeleine McCann's "ex-lover", suspect Christian Brueckner, refused to answer questions about her today when MailOnline asked him to tell the truth.
Nicole Fehlinger was accused by a Portuguese couple of giving Brueckner a tip to steal a family's savings.
Neither Brückner nor Fehlinger have been arrested or charged with this crime, and it is not known whether the allegations are credible.
Some think that if Fehlinger is connected to Brueckner, she may have the key to solving the mystery of what happened to the missing three-year-old.
She has been accused on Portuguese television of working with the German drifter to carry out a burglary in the Algarve that has a frightening resemblance to the break-in at McCann's apartment in Praia da Luz in May 2007.
However, the 43-year-old, who is pictured in front of her house in Bavaria today, refused to deny any involvement in Madeleine's disappearance or to clarify her relationship with Brueckner – according to her claims, she hardly knew that he was exposed as untrue.
Nicole Fehlinger, 43, pictured in front of her home in Bavaria. She refused to deny any involvement in Madeleine's disappearance or to clarify her relationship with Brueckner
Court documents in Portugal have shown that she regularly spoke to Brueckner on the phone and spent a romantic weekend together in Lisbon – just a few months after Madeleine disappeared in May 2007.
Nicole Fehlinger was accused of giving the German drifter a tip to steal a family's life-saver from a house on the coast of Praia da Luz in November 2007.
The Portuguese TV crime series Friday at Nine reported: “As in the case of Maddie, the call came just before the crime and signaled that the house was free.
"A man, whom neighbors described as Christian Brueckner, spoke on the phone and went with a backpack with a heavy tool on it."
The family contacted the police and accused Fehlinger of being involved in the break-in, but the case was never resolved.
When asked who she had called on a disposable cell phone shortly before the break-in of EUR 100,000 in Albufeira, Fehlinger replied: "Christian Brueckner."
However, the mother of three children has always claimed that she hardly knows the German serial sex offender.
Nicole Fehlinger reportedly said to a friend: “I only met Christian Brueckner six or seven times. We knew each other, but I wasn't his girlfriend.
The Fehlinger pictured in Germany was exposed yesterday evening as an accomplice to the German drifter, who was able to hold the key to deciphering the mystery of what happened to the three-year-old
Fehlinger in front of her house in Germany. She is said to have had a passionate nine-month relationship with Brueckner in 2007 while her long-time friend was in Germany
"One day I came home and he was in my neighbor 's garden and they were talking about cars.
“My neighbor told me he was German and he introduced me. Because we are both German, we started talking.
Some time later he asked if he could park his RV in front of my house. He asked if he could take water and some electricity. I said why not. "
Fehlinger, who looked after children under a German support program, added: “He sometimes came into the house – to eat something and take care of the children.
"I wasn't interested in him. I had my own boyfriend back then. But I can't say that he wasn't interested in me. "
Fehlinger was interviewed twice by the BKA federal police, which heads the investigation into the Madeleine McCann case about her relationship with Christian Bruener.
The hotel receptionist has repeatedly claimed that she had nothing to do with the youth's disappearance.
Detectives in northern Germany have desperately asked for information for six weeks to connect Brueckner [left] with Madeleine's [right] kidnapping
But her father – who was shocked when Brueckner revealed that he could smuggle drugs and children in his RV – doesn't think she told everything she knows.
Dieter Fehlinger said to a friend: “Nicole doesn't tell me everything about her life in Portugal.
"I don't know what I can believe about what she told me."
Nicole is said to have had a passionate nine-month relationship with Brueckner in 2007 while her long-time friend was back in Germany.
Her father added: “Nicole went to Portugal with a friend. But he wasn't there when I went to visit. She told me he was back in Germany.
"I later found out that when the friend came back, Brueckner said he should get out."
Mr. Fehlinger was interviewed by the BKA federal police last month after he announced that Brueckner had bragged about being a drug smuggler and being able to hide children in his mobile home.
He revealed: “There were two plainclothes officers. You interviewed me for about two hours.
"I told them everything – about the motorhome, the drugs and the children."
The 65-year-old former father of an ambulance driver visited his daughter Nicole in the villa, where she helped rehabilitated restless German teenagers in early 2007 when Brueckner arrived in a large cream-colored Winnebago motorhome with Hanover license plates.
Dieter explained: "When I looked inside, I asked him:" Mr. Brückner, what are you doing in Portugal? What are you working?"
Fehlinger pictured with a dog in front of their home in Bavaria. Her father doesn't think she told everything she knows
He said to me: “I work, I get money because I have a special business. I transport grass [cannabis] in my van. “I was surprised, I didn't really believe it.
"Brueckner told me again:" I have 50 kg of grass and I transport it across Europe. "I thought he was joking at the time. He said:" In my van I can take 50 kg of grass, nobody can see it. "
He said to me: "I can transport children, children, into this room. Drugs and children, you can transport them in this van, it is a safe place in the van, nobody can find them. Nobody can catch you. "’
Last month, German police named Brueckner the main suspect in the kidnapping and murder of three-year-old Madeleine, who disappeared on vacation on May 3, 2007 in Praia da Luz with her parents Kate and Gerry McCann.
Detectives in northern Germany have desperately asked for information for six weeks to link Brueckner to the kidnapping of the youth, but have not yet received the crucial evidence they need.
Prosecutor Hans Christian Wolters, who heads the investigation, has told the McCanns that they have concrete evidence that Madeleine was killed in the biggest breakthrough in the 13-year-old case.
He said he hoped to indict Brueckner in the next two months – but added that her investigation will not drag on forever.