She made it through 13 days in jail and 23 days at an inpatient rehab program, but friends of the actress worry that she's in danger of sliding back into her old ways.
"Lindsay says she's determined to stay sober and focus on work," says a Lohan source. "[But] it's too soon to tell what will happen. We've seen these moments of 'purity' before, but as soon as she gets a taste of the nightlife and the drama, she usually falls back into old habits fast."
Lohan, 24, got a taste of nightlife, at least, in the wee hours of Thursday morning when she was spotted cruising around Los Angeles in a Maserati with friends in tow and an energy drink at her side.
Another source who knows Lohan says the actress "doesn't like staying put and she doesn't like being bored. She needs to be constantly stimulated; it's not uncommon for her to be up texting from 4 a.m. to 8 a.m. The people in her life are on a constant roller coaster."
But Lohan's lawyer, Shawn Chapman Holley, insists her client is ready to change her life. And for now, at least until a Nov. 1 hearing, Lohan must keep to a strict regimen of random drug testing, psychotherapy and addiction counseling.
"She is serious about her sobriety," Holley told the judge in the case on Tuesday. "She looks forward to proving to the court ... that she's moving forward in a positive manner." Holley later told reporters: "This is a new beginning for Lindsay Lohan."
Friends, though, remain wary and are keeping an eye on the young star.
"Deep down, I think she knows she's in crisis," says the second source. "But she continues to make bad decisions. She still thinks she can get away with anything, get out of anything, make excuses."
Reporting by ALYSSA SHELASKY and AILI NAHAS