CHICAGO (AP) - A California woman who survived a seven-story fall from a Chicago public housing tower has been released from the hospital after a four-month stay.

Christina Eilman, 21, flew to the Sacramento area with her parents after being released from the Rehabilitation Institute of Chicago on Tuesday, said the family's lawyer, Jeff Singer.

Eilman suffered severe brain trauma in the May 8 fall and cannot walk, but has made progress recently, Singer said.

The circumstances of Eilman's fall are the focus of an internal investigation by the Chicago Police Department and a $100 million federal lawsuit against the city.

Eilman's parents allege police knew Eilman was mentally ill soon after arresting her on a train platform at Midway International Airport on May 7. Family members have said they called police several times and warned them she suffered from bipolar disorder and asked them to take her to a nearby hospital's psychiatric unit.

Shortly after her May 8 release, Eilman was abducted, sexually assaulted and plunged from a window of a Robert Taylor Homes building located less than a mile from the police station, the lawsuit alleges.

A Chicago man has been charged with aggravated criminal sexual assault, attempted criminal sexual assault and unlawful restraint in the case.

City lawyers have indicated in court that an internal investigation would likely result in discipline against officers. Attorneys have given Singer 47 statements from police officers and witnesses, but they were filed under a protective order preventing them from being made public, officials said.