06/22/2009 AT 04:25 PM EDT
In her continued battle with cancer, Farrah Fawcett has again returned to a Los Angeles hospital a source tells PEOPLE. The actress has been hospitalized for at least two weeks.
The source indicates that the actress, who was first diagnosed with anal cancer in 2006 and whose illness was chronicled in the recently aired NBC documentary Farrah's Story
, is not doing well.
"There was a moment last week when she was supposed to be released and was going home but things changed," says the source.
Fawcett's publicist Arnold Robinson says, "She is still being treated for her condition."
Longtime partner Ryan O'Neal has been a constant presence at Fawcett's side during her latest hospitalization. In an interview with Barbara Walters to be aired this week on ABC, O'Neal says
, "I've asked her to marry me again and she's agreed."
Farrah, 62, and Ryan, 68, first began dating in 1979. They have one son together, 24-year-old Redmond O'Neal.
With Reporting by JENNIFER GARCIA