Fallen party queen Lindsay Lohan took a break from lockdown yet again (supervised, this time) to visit to a grocery store near the Wonderland facility she presently calls home. 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.