How Lindsay Lohan Stays "Busy" in Rehab

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Lindsay Lohan could be released from rehab as early as this week.

How has she been spending her time?

Designing for her 6-1-2-6 fashion line, says mom Dina.

"Lindsay's busy every day, actually, sketching," Dina tells Extra of her daughter, 24, who checked into UCLA Medical Center Aug. 2 after serving 13 days behind bars for violating probation in her DUI case.. "We're great, we're doing well."

She also has been biding time responding to fan mail.

"She's just thankful and grateful for all of her fans," Dina says. "They have been sending her letters and cards, and Lindsay has been answering them, so we're really pleased about that."

Celebs are also reaching out to the actress, 24 -- including Kim Kardashian. "Yeah, she's been great," Dina says. "I'm friends with her mom, Kris, and they've been successful in their own right as well. We love them."