The star was several minutes late walking into the probation hearing on Monday. Lohan's attorney Shawn Chapman Holley told the judge they were stuck downstairs trying to make their way through a crowd of paparazzi into the courthouse.
During the hearing, the judge ordered Lohan to wear an alcohol monitoring bracelet, to abstain from alcohol and drugs and to submit to random drug and alcohol testing once a week.
She must also attend all scheduled classes.
Holley asked that the "SCRAM" monitoring device not be installed yet, to "allow her also to make a living," saying the actress also has a number of upcoming photo shoots and a current movie project in Texas.
Revel, who reportedly delayed a vacation to hold the hearing for Lohan, was unsympathetic to Holley's request. The judge suggested that Lohan may need to "delay" her work in Texas.
Holley tried to argue the location of the random drug testing, but the judge wouldn't budge.
"She needs to submit to random drug testing here, not in Texas," Revel said. "There is no excuse if she is in Texas to say she can't show up because then it's not random. So she is going to have to delay that now because it will prevent her from complying with the court's order."
Lohan was hoping to complete her remaining alcohol treatment classes all in one week, but her request was denied.
"If she wants to do extra ones, she can do extra ones, but the court's order is one a week," said Revel. "I've been told in the past there's a reason to do one a week, as opposed to all in one week and get them over with. You get more benefit out of it."
Holley noted that Lohan had missed one previous hearing after her uncle died.
"Did she attend the funeral?" Revel asked. Holley turned to Lohan, who sadly shook her head no.
The 23-year-old avoided arrest by posting $100,000 bail, but still faces the other conditions imposed by the judge.
Another hearing was scheduled for July 6 at 8:30 a.m. to determine if Lohan has violated her probation conditions when she missed the previous hearing last Thursday.
ABC News legal analyst Dana Cole says Lohan needs to be on her best behavior or the consequences could be severe.
"Just from the demeanor of the judge today, it's obvious there will be no slack whatsoever. If she violates by drinking, using drugs, failing to complete her alcohol program, anything like that, she's going to jail," said Cole.
Eyewitness News reporter Lisa Hernandez contributed to this report.