Nach ihrem Schulabschluss absolvierte Kleinert eine Lehre zur Keramikfacharbeiterin.
Von 1987 bis 1990 besuchte sie in Leipzig die Theaterschule „Hans Otto“.
Anschließend absolvierte sie ein zweijähriges Praktikum am „Neuen Theater“ in Halle.
Von 1991 bis 1993 hatte sie ein Engagement am Brandenburger Theater.
Seit 1993 kennt man Kleinert vor allem aus Fernsehkrimis.
Sie war unter anderem als Eva Kowalski in einigen Folgen der Serie Sperling sowie im Polizeiruf 110, Ein Fall für zwei und im Tatort, aber auch in der Serie Unser Lehrer Doktor Specht zu sehen.
Von 1999 bis 2003 spielte sie in der RTL-Serie Doppelter Einsatz als Ellen Ludwig an der Seite von Despina Pajanou.
Seit 2008 ist sie in der Serie Mord mit Aussicht in der eher komischen Rolle der neugierigen Polizistenfrau Heike Schäffer zu sehen.
Seit 2013 hat sie die Rolle der Sittenpolizistin Dagmar Schnee in der ZDF-Serie SOKO Leipzig.
The cabaret artist Marc-Uwe and the kangaroo are faced with a problem: Lisbeth, the mother of Maria has taken a wrong turn somewhere and is now denying the climate crisis on the Internet. How can she be brought to her senses? The two make a bet with each other: If they don't manage to bring Maria's mother to her senses, they will lose their apartment. So Marc-Uwe and the marsupial embark on a trip to the Conspiracy Convention in Bielefeld and shortly thereafter become part of a tangible conspiracy led by conspiracy guru Adam Krieger and his followers. As the two flatmates talk their heads off, it's no longer just about their apartment for Marc-Uwe and the kangaroo, it's more than that: it's a matter of life and death!
Eleven-year-old Linh shows great grace under pressure. When her mother, who’s raising her kids on her own, has to return unexpectedly to Vietnam, Linh looks after her little sister Tien and the family restaurant on her own. Of course, no one is supposed to find out, not the school, not the neighbours, and definitely not child protective services. But Linh’s biggest problem has red hair, a telescope and a sly grin: Pauline. The daredevil from across the street has the whole neighbourhood under surveillance and can’t imagine anything cooler than a life without parents. When Pauline blackmails the Vietnamese sisters into starting a gang with her, the three girls set off on a daring adventure.
Gundula Glöckner is very worried about the salvation of her daughter Lena. Again and again, the young woman gets to the wrong men. To help her child's happiness, the resolute widow shortly sets out on a pilgrimage: in Padua she wants to pray for Lena at the tomb of St. Anthony. However, the illustrious Pilgrims on their way to Italy are struggling with a whole series of mishaps and complications. Especially the brash bus driver Benno brings the God-fearing Gundula again and again to the white heat - until she realizes that hides behind its rough shell a vulnerable core.
Structural change and unemployment in Schönstett are a real problem for Julia Fischer and her husband Martin. Especially since Martin acts as a houseman after his company went bankrupt and Julia brings the money home. A seemingly ingenious deal by the mayor is intended to remedy the situation and provide an upswing. But when women riot, a planned sit-in turns into an unscheduled sex strike...
Julia Whitman and her daughter Jody flee their husband and father’s violence to a doomsday paradise. Julia meets Matthey Haley in New Zealand and falls in love despite her inner resistance. However, the shadows of the past will not let you forget. Julia's ex-husband, Charles, who follows in the footsteps of his wife and daughter, shows up on the island.
Erich Kasulke and Rudolf Portmann are comedian stars of the former GDR. When the Wall falls, so does their success. Portmann becomes a successful businessman, while Kasulke tries to continue working on the comedy circuit - without success. When his wife also cheats on him, he decides to start a new life in Berlin. There he quickly meets his old friend Portmann, who has built up a huge company. He offers him a job. But Erich puts the entire company in danger...