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OTRC: Dina Lohan: Lindsay's happy, relaxed in rehab

Dina Lohan speaks to 'The Today Show' on Nov. 8, 2010. (NBC)

Lindsay Lohan's mother Dina says her daughter is "happy" and relaxed" as she continues treatment at the famed Betty Ford Center as part of court-mandated rehab given after failing a drug test in September.

The 24-year-old actress has so far spent more than a month at the facility, where celebrities such as Elizabeth Taylor, Gary Busey, David Hasselhoff, Ozzy Osbourne and the late Anna Nicole Smith have undergone treatment for addictions to drugs and alcohol.

This is Lindsay Lohan's fifth stint at a treatment center. A judge had sentenced her to rehab earlier this year at a hearing on her probation for a 2007 DUI arrest. The actress had pleaded guilty to being under the influence of cocaine and no contest to driving with a blood-alcohol level above 0.08 percent and reckless driving.

Lindsay Lohan is due back in court on February 25 and must continue to undergo random drug tests. Meanwhile, she has been ordered to remain at the Betty Ford center until at least Jan. 3, 2011 - past the Christmas and New Year's holidays - and Dina Lohan said her daughter may stay there longer.

"Lindsay wants to stay," Dina Lohan said on The Today Show on Monday. "She's learning the trigger points and why she turns to something, drugs or addiction. "We take it one day at a time. Addiction is difficult."

"She's just a different person," Dina Lohan added. "She's been in a couple of facilities but this one, to me, has really changed her. They bring the problem to the surface. The Betty Ford center is such an amazing place."

Last week, Lindsay Lohan took a break from rehab to do some shopping. The actress bought about $250 worth of loungewear at the teen-oriented women's clothing store Forever 21 at a mall in Palm Desert, California, according to People magazine.

Lindsay Lohan has completed three stints in jail stemming from her DUI case - the first lasting 84 minutes, the second, 14 days. Last month, she spent 15 hours behind bars after she failed a drug test and wrote about it on her Twitter page. A judge later allowed her to post bail and leave jail. She began a new rehab stint days later.

In August, Lindsay Lohan completed jail and rehab stints that were shortened, reportedly due to overcrowding. she was given the sentence because she violated her probation from her DUI case by not attending all court-mandated alcohol education classes.

- Corinne Heller