January 25, 2007 07:40 AM

Since checking into the pampering Wonderland Center addiction-treatment facility last week, Lindsay Lohan has been keeping a low profile – and loving it.

“She’s been sending text messages from rehab saying she’s the happiest she has ever been,” a pal tells PEOPLE in its new issue. “She seems under control right now.”

Lohan, 20, who had planned to attend the Sundance film festival, has instead been taking hikes on the center’s lush three acres and attending treatment meetings.

The hillside Wonderland has all the amenities of a spa, including yoga instructors and beauty constultants. Says Dr. Howard C. Samuels, the center’s executive director: “We treat the individual’s emotional, spiritual and physical ailments.”

Should Lohan wish to step out, the new facility allows patients to attend professional and social engagements, typically with a “sober companion” – a Wonderland staffer – in tow.

So far the kid-glove treatment seems to be agreeing with the actress – which must come as a relief to her family and friends, who had watched with increasing concern as she kicked off the new year by partying hard and fast.

The final straw? When Lohan – who in December revealed she had been attending Alcoholics Anonymous meetings – hit Hollywood’s Les Deux on Jan. 5, less than 24 hours after having her appendix removed.

“That’s when (those in her inner circle) said, ‘We can’t make excuses for this,’ ” says a source. “She was like, ‘You’re right. So let’s do something about that.’ ”

For now Lohan – whose upcoming thriller I Know Who Killed Me is temporarily on hold – is focused solely on taking it easy.

“Hollywood’s a really, really busy, scary place,” says her mom, Dina. “She’s getting a grip on her life.”

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