Lindsay Lohan's mother Dina and sister Ali visited the jail for more than an hour Wednesday, but only saw the actress for about 30 minutes. They departed stern-faced without commenting to reporters. With them during the stay was Lohan's business manager, Lou Taylor.
Visiting hours at the Century Regional Detention Facility in Lynwood, Calif., are on weekends for family and friends, though the jail can make exceptions. Family members also may leave money for an inmate's account to buy snacks, toiletries and stationery.
Lindsay, meanwhile, has "slept soundly for most of her time in custody" but has been worrying about her safety, a jail insider tells PEOPLE.
According to the source, Lohan, 24, who is likely to serve two weeks of a 90-day sentence for violating probation in a DUI case, has expressed her fears of being housed with other inmates, even though she's been repeatedly reassured she'll be kept isolated in her own cell.
But, the source says, Lohan has been "cooperative," and she appears to be adjusting to life behind bars slowly – and satiating her appetite. Wednesday morning, she ate the jail's typical breakfast of cold cereal and a hard-boiled egg and has "devoured all the food served to her" since she was booked, says the source.
And like any other inmate, the actress has also undergone a series of intake interviews.
So far she's spoken with one jail official and a jail doctor, who has approved Lohan to take medication to help her sleep and also for ADHD and anxiety. While on probation, Lohan had been allowed to take Nexium (for heartburn), Zoloft and Trazodone (both antidepressants), Adderall (for ADD) and painkiller Dilaudid (for dental pain).
Reporting by KEN LEE and DONNAMARIE BARNES