The mummy, called La Doncella or The Maiden, is that of a teenage girl who died more than 500 years ago in a ritual sacrifice in the Andes Mountains.

Momia Juanita also known as the Lady of Ampato and the Inca Ice Maiden, is the well-preserved frozen body of an Inca girl who was killed as an offering to the Inca gods sometime between 1450 and 1480 when she was approximately 12–15 years old.

The teenage Maiden consumed more of the elite food than the Llullaillaco Boy and Lightning Girl, who were both 4 to 5 years old, Wilson noted. (The three children were previously believed to be about two years older than these estimates, but a new analysis of CT scans suggests otherwise.)

She was discovered on the dormant stratovolcano Mount Ampato (part of the Andes cordillera) in southern Peru in 1995 by anthropologist Johan Reinhard and his Peruvian climbing partner, Miguel Zárate.

The scientists analyzed the mummies' hair for cocaine (a major alkaloid of coca leaves) and its metabolite benzoylecgonine, as well as cocaethylene, which forms when both cocaine and ethanol are present in the blood. The scientists created a timeline of coca and alcohol consumption for the children due to respective hair lengths, the chronology for the younger children only went back to about nine months before their deaths, whereas the Maiden's timeline spanned about 21 months before death.

She is known as the Lady of Ampato because she was found on top of Mount Ampato. Her other nickname, the Ice Maiden, derives from the cold conditions and freezing temperatures that preserved her body on Mount Ampato.

The Llullaillaco Boy had blood on his cloak, a nit infestation in his hair and a cloth binding his body, suggesting he may have died of suffocation. The Lightning Girl didn't appear to be treated as roughly as the boy, though she didn't receive the same care as the Maiden. she lacked, for example, the Maiden's decorated headdress and braids.

Juanita has been on display at the Catholic University of Santa María's Museum of Andean Sanctuaries (Museo Santuarios Andinos) in Arequipa, Peru, almost continuously since 1996, and was displayed on a tour of Japan in 1999.

In 1995, Time magazine chose her as one of the world's top ten discoveries. Between May and June 1996, she was exhibited in the headquarters of the National Geographic Society in Washington, D.C., in a specially acclimatized conservation display unit. In its June 1996 issue, National Geographic included an article dedicated to the discovery of Juanita.