AceShowbiz - Lindsay Lohan's father is adamant the actress is not to blame for an alleged altercation with a member of staff at a rehab clinic, claiming the employee "had it in for Lindsay" and snapped when the star was 10 minutes late after a trip to a hair salon.

Police in Palm Desert, California have launched an investigation after a worker at the Betty Ford clinic claimed to have been hurt in a dispute with Lohan on December 12. Dawn Holland, who has been dismissed from Betty Ford for talking to the media about the incident, alleges Lohan was caught sneaking back in to the clinic after her curfew, and also claims the star had been drinking.

A 911 call was placed from the center at 1.03am on December 12 and Lohan's lawyer claims the actress called in police herself. Lohan's father Michael is adamant his daughter should not be blamed for the incident, insisting she was merely 10 minutes late on her return from a hair appointment.

He tells E! Online, "She (Holland) had it in for Lindsay the whole time. As soon as Lindsay walked in the door the woman grabbed Lindsay by the arm, and not the other two girls (she was with), and said, 'You are going to take a urine test'. Lindsay just brushed her off. That is what she told me: 'Dad, I just brushed her off.' It all boils down to that they were 10 minutes late. Lindsay had three weeks left and this woman was in Lindsay's face, constantly complaining."

Lohan's mother, Dina, has also spoken out about her daughter's troubles, telling the New York Post, "There's a mole in the place. Someone in there's trying to hurt her before she gets out."

Meanwhile, Lohan's lawyer has confirmed the actress called police from rehab on the night she is alleged to have lashed out at a member of staff. Holland alleges Lohan was in a "very angry" state when she was caught sneaking back in to the clinic after her curfew, and also claims the star had been drinking. Cops attended the scene after a 911 call was placed, and although no arrests were made, police officials in Palm Desert, California have confirmed they are investigating the case, according to EW.com.

Lohan's attorney Shawn Chapman Holley has revealed it was the actress herself who called in authorities, saying in a statement, "At this time, we are declining to comment on the underlying facts surrounding this incident, as we await the completion of the police investigation. It should be noted, however, that it was Ms. Lohan who called 911 to request police assistance at the time this incident occurred."