Last December at Betty Ford during Lindsay Lohan's sixth trip to rehab, Lindsay assaulted a staff member after she had the nerve to ask Lindsay why she was sneaking back in through a window and smelling of alcohol. Since Lindsay has been on probation for 20 years, the Palm Desert Police Department launched a complete investigation and wanted the DA to pursue. But just before Holland was to testify, Lindsay had Dina pawned some of the shit she stole and paid Holland $25K to keep quiet and refuse to cooperate with police. Now she wants $1M more. TMZ reports:

Lindsay Lohan dished out 8 to 10 seconds of pain when she attacked a Betty Ford employee last year ... so says the alleged victim who's filing a lawsuit against the actress -- but her story appears to have one MAJOR inconsistency. Dawn Holland -- who now goes by Dawn Bradley -- is all set to file the legal docs today ... in which she claims Lohan was combative and violent when she tried to give the actress a breathalyzer test at the rehab center back in December ... after Lohan had allegedly snuck off the property to go boozing. In the lawsuit, Holland claims Lohan grabbed her right wrist and began "twisting and pulling it for 8-10 seconds." But here's the rub -- back when Dawn filed her initial incident report with the BFC, she NEVER mentioned the wrist grab ... even though the rest of her story syncs up perfectly. Holland -- who was eventually fired from Betty Ford Center -- claims she suffered "great mental, physical and nervous pain and suffering" from the alleged assault and battery. Dawn is demanding AT LEAST $1 million to make things right. We contacted Lindsay's lawyer. So far ... no comment.

Does Lindsay even have a million dollars? I can't imagine Dawn Holland wants to walk down the street pushing a wheelbarrow full of quarters and a Vietnamese baby Lindsay took from a stroller.