Lindsay Lohan is spending her time in rehab sketching

The troubled actress' mother Dina Lohan has revealed her daughter is making good progress since she left prison and entered the UCLA Medical Center in Los Angeles to complete a court ordered 90-day treatment program and is spending her days drawing.

Dina told TV show 'Extra': "Yeah she's wonderful, we're great, we're good. Lindsay's busy every day, actually, sketching.

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

Lindsay, 24, was sentenced to 90 days in jail and 90 days in rehab in July for breaking the terms of her probation for a 2007 driving under the influence (DUI) conviction.

Among Lindsay's well-wishers is reality TV star Kim Kardashian who has sent her messages of support, something which hasn't gone unnoticed by Dina.

Speaking about Kim, Dina added: "She's been great. I'm friends with her mom, Kris, and they've been successful in their own right as well. We love them."

It is believed 'Mean Girls' star Lindsay may not have to finish the full 90 days in rehab, and could be released this week after doctors concluded her psychiatric problems are not as severe as they initially thought.

If Lindsay – who is also being treated for problems with prescription drugs - is to be released it will have to be approved by a court, and she will still have to visit the centre as an outpatient.