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Queen of Versailles, Family

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Victoria Siegel, daughter of billionaire David Siegel, died from a "methadone and sertraline toxicity," according to the autopsy obtained by E! News.

The coroner has ruled Victoria's death, which took place in June, an accident. At the time, her parents believed that their daughter didn't commit suicide, but said they thought she was self-medicating to help deal with a cyber attack.

"I don't think (she) had any intentions of killing herself. I think she just wanted to soothe the pain she was going through," said Jackie Siegel, Victoria's mother.

"This should've been a happy time of celebration where I would have been walking her down the aisle and she would have started a new life as a new wife and a new mother," said David. "Instead we are having to bury her."

In the time since, nothing has gotten any easier for their family, and Jackie tells Inside Edition in an interview airing July 30 that she hasn't been able to step inside her Windermere home since her 18-year-old daughter died. "As a mother, I can say it's the most horrible thing I have ever experienced, and I personally have not stepped foot inside the house since Victoria died. I haven't been back to the house," she explains.

"One of the bedrooms was going to be hers and I haven't been back there."

Before the Siegel family officially said goodbye to their beloved Victoria, Jackie was spotted taking a picture of her daughter's casket as it was being placed inside of a hearse. Michael Marder, the family spokesman, defended Jackie's actions at the time.

Queen of Versailles, Jackie Siegel

Gerardo Mora/Getty Images

"People deal with grief differently. Mrs. Siegel is grieving as we all are. I have been with the family starting from the very first moment they learned of Victoria's death and I can tell you that she has cried ... a lot ...and has been on an emotional roller[coaster]," he said.

Now, Jackie tells Inside Edition that she just wanted to remember her daughter. "It's my last moment to remember my daughter and that day. I know there's no book what you should and shouldn't do at a funeral. I just love my baby so much and I just want every last minute to remember her by," she explains.