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Gene Page—ABC via Getty Images

Teen Daughter of Queen of Versailles Stars Struggled With Addiction to Prescription Drugs

The 18-year-old daughter of Queen of Versailles stars David and Jackie Siegel struggled with an addiction to prescription drugs, a family spokesperson said Monday.

Victoria Siegel was found unresponsive at about 2 p.m. on Saturday by a housekeeper at the family compound on Green Island Cove in Windermere, Florida, and was transported to Health Central Hospital where she was pronounced dead, according to the Orange County Sheriff's Office.

Siegel family spokesperson Michael Marder said Victoria had a history of seizures and was prescribed medication for the condition.

"Unfortunately she became dependent and struggled with this condition," said Marder in a statement on Monday. "She voluntarily underwent rehabilitation and was working hard to address this problem."

The Siegel family was away at a wedding in Park City, Utah, when the incident occurred. They had plans to return to Orlando on Sunday, to begin a family cruise on the following Monday.

"David and Jacqueline were immediately notified and returned to Orlando the same day," Marder said.

An autopsy has been performed on Victoria but the cause of death has not yet been determined.

"It is likely that Victoria ingested one or more drugs prior to her death, however, we cannot determine at this time whether or not the drugs she took were in fact prescribed medication, something else, or where and how these drugs may have been obtained," Marder said. "We will have these answers as the investigation continues and the toxicology report is released."

Victoria's father, David, is the founder of Westgate Resorts, which is the largest timeshare company in the world. David and Jackie were featured in a 2012 documentary, Queen of Versailles that chronicled their financial struggles as they built a 90,000-square-foot palace they dubbed, the Versailles House.

Recently, the billionaire couple, who have eight children, appeared on ABC's Celebrity Wife Swap where Jackie switched places with actress Juliet Reeves London, wife of Party of Five actor Jeremy London.

"Victoria was a beautiful spirit with a wonderful smile who was greatly loved, and will be deeply missed," Marder said.

This article originally appeared on PEOPLE.com

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