Burger was last seen at a residence on Bogey Circle in New Smyrna Beach, Florida on July 25, 2011. She has never been heard from again. Her father, who reported her missing, stated her drug problem may have caused her disappearance. She left her pet dog behind at her home.

In November 2011, authorities announced they were seeking to question Burger's daughter, Christina Lea Thompson Hilgefort, age 38, and son-in-law, Allen Arthur Hilgefort, age 33, for questioning in her disappearance. They were being sought as possible witnesses rather than suspects in her case. The Hilgeforts and their two-year-old son had lived with her until July 25, when she asked them to leave and they moved into a motel. They all disappeared on July 28, but weren't reported missing. Photographs of the couple are posted below this case summary. Both of them have criminal records; Christina has been arrested several times for alcohol-related incidents and Allen previously served a year in prison for burglary. Investigators located the family after they were involved in a traffic crash in Ohio in late December. The police haven't said why the Hilgeforts disappeared or whether they had anything useful to disclose about Burger's disappearance.

Burger may be traveling in a white 1994 Ford Ranger pickup truck purchased by the Hilgeforts. It has no license plates and is still registered in the name of its previous owner, Elaine Culp. Burger's case remains unsolved and the circumstances of her disappearance are unclear.

Left: Allen Hilgefort;
Right: Christina Hilgefort