A rehabilitation worker told an emergency dispatcher that she ordered Lindsay Lohan to pack her bags and leave the Betty Ford Centre after the actress hit her during an argument, according to a recording of the call.
The six-minute call started with a chaotic exchange between Mean Girls star Lohan and the worker, Dawn Holland, arguing over control of the phone at the clinic in Palm Desert, California.
Later, Ms Holland told the dispatcher she wanted to press charges.
"I have a problem because Lindsay Lohan pushed me and hit me with the phone while I was trying to talk to you," Ms Holland said on the recording.
Lohan, 24, was nearing the end of a three-month court-ordered rehab stint at the centre after authorities said she failed a drug screening.
The December 12 call resulted in an investigation by Riverside County sheriff's detectives into Ms Holland's accusations. Prosecutors said on Tuesday that they found insufficient evidence to file any charges.
At one point during the call, Lohan told the dispatcher she had never seen Ms Holland before.
"She's freaking me out," Lohan said, when she was able to get on the phone.
Commotion was then heard before Ms Holland returned to the line. "Lindsay, you need to pack your (expletive)," Ms Holland told the actress. "'Cause now I'm getting ready to file charges on you."
Ms Holland was later sacked by the centre after giving an on-camera interview to celebrity website TMZ.