Her father, Michael, told E! Online that Lindsay spent the first stage of her treatment detoxing from alcohol and narcotics, including the painkiller OxyContin, and then would receive intense counseling to avoid using again. The elder Lohan also said that Lindsay had been using cocaine, but didn't specify when she took the drug.

Lindsay Lohan was expected to check out of rehab earlier this week, but mother Dina announced Monday that Lindsay was extending her stay.

Lindsay's sobriety struggles have also led to the cancellation of her much-hyped (and much-maligned) 21st birthday celebration originally scheduled to be a multiday blowout in Las Vegas next week.

Instead, Dina says she and Lindsay's kid sisters are planning to mark the occasion on Monday with a quiet get-together away from the Promises campus.

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