Paris, 15, has been hospitalized at California's UCLA Medical Center since early this month when she cut her arm with a kitchen knife and ingested numerous Motrin pills.
"Paris absolutely tried to kill herself, and it wasn't the first time," an insider told TMZ.
Although she is expected to make a full recovery from her wounds, sources told the celebrity news website Paris is in denial about her actions and fighting therapy for depression.
She is expected to move from UCLA to another treatment center soon and could be there for three months, TMZ said.
Paris and her two brothers have been living with their paternal grandmother, Katherine, since their father's 2009 death.
Michael's physician was convicted of involuntary manslaughter for administering lethal amounts of sedatives and anesthesia to the insomniac singer in an effort to help him sleep.