Los Angeles -LRB- CNN -RRB- -- Lindsay Lohan must start serving a 30-day jail term next week after admitting that she violated her probation on a necklace theft conviction , a Los Angeles County judge ordered Wednesday . `` It 's possible she could be booked in and booked out '' the same day , Los Angeles County Sheriff spokesman Steve Whitmore said Wednesday afternoon . `` It depends on the fluctuations of the day , what 's going on in the jail , '' Whitmore said . After that , the actress must work at least 12 days a month at the county morgue until she completes the 53 remaining days on her court-ordered community service and she must attend 18 psychotherapy sessions , Judge Stephanie Sautner told her . If Lohan misses any of those goals , she will be returned to jail for another 270 days , the judge ruled . `` This is what we really call putting the keys to the jail in the defendant 's hands , '' Sautner told Lohan . The actress , who admitted violating her probation during a hearing Wednesday , must report to the Los Angeles County jail by November 9 , the judge said . `` You are not to get house arrest or early release , except for that required by the law , '' Sautner said . Whitmore said that the early release program is part of the law , meaning Lohan would likely get out quickly due to overcrowding . When Sautner sentenced Lohan to 120 days in jail last May , she ended up serving 35 days of home confinement instead , due to jail overcrowding and state rules that give prisoners credit for good behavior . It was not immediately clear how many days Lohan will actually serve this month , if she ends up getting credit for good behavior . Prosecutors said Lohan missed 12 of 20 scheduled workdays at a downtown Los Angeles women 's center , part of the court-ordered community service imposed in May when she pleaded guilty to stealing a necklace from a Venice , California , jewelry store . Lohan , 25 , was already on probation for two drunken driving convictions from 2007 . She also canceled 14 of 19 scheduled appointments for court-ordered psychotherapy , they said . `` From what I see of you , you need a structure , '' Sautner told Lohan Wednesday , instructing her to return to court each month , starting December 14 , to show she is complying with the schedule . If the actress stays on track , her probation would be eased on March 29 , 2012 , Sautner said . If she does n't keep up with the requirements , she will serve the additional 270 days behind bars , the judge said . The full sentence imposed Wednesday was 150 days for the necklace theft probation violation and 150 days for violating probation on the 2007 drunk driving conviction in Beverly Hills . While the original sentence included 360 hours of community service at a downtown Los Angeles women 's center , the judge said she did not want to put the Skid Row charity through the pain of Lohan again . When the judge called The Good Shepherd Center for Homeless Women , the charity refused to take Lohan on as a worker `` saying you were a bad example , '' Sautner said . But Lohan seemed to find a good fit with her work at the Los Angeles County morgue , where Deputy Chief Coroner Ed Winter said she worked four days in the past two weeks cleaning up . Lohan reports for morgue duty `` So , the morgue is willing to keep you , '' the judge said . All of her community service work has been transferred there , she said . Two weeks ago , the actress ' father , Michael Lohan , told HLN 's `` Issues with Jane Velez-Mitchell '' program that his daughter should n't be in jail , but in rehab . Last week , Michael Lohan was arrested twice in two days for violating a court order to stay away from his former girlfriend . CNN learned Wednesday that he is now in an `` administrative confinement '' cell in the infirmary section of Orient Road jail in Tampa , Florida , where he 's awaiting trial . Michael Lohan arrested Lindsay Lohan 's legal woes , which began four years ago with two drunk driving arrests , have been compounded by her failure to attend counseling classes , and alcohol and drug test failures . Her probation is scheduled to end within a year unless Lohan breaks any laws before then . It has been extended several times because of violations , including the failed alcohol and drug tests . `` It 's possible she could be booked in and booked out '' the same day . '' CNN 's Michael Martinez contributed to this report .