"She was always pretty quiet," a source tells PEOPLE of Chelsea

By Michele Corriston
Updated August 27, 2015 03:30 PM
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Getty; Courtesy Rosie O'Donnell

As Rosie O’Donnell‘s daughter Chelsea leaves the star’s home to move in with her biological mother, a source tells PEOPLE the teen had been wanting to move out for a while.

“She apparently told some people she going to leave as soon as she turned 18,” the source says.

Chelsea turned 18 Monday, and a rep for O’Donnell confirmed to PEOPLE on Wednesday that she chose to relocate to Wisconsin and live with her birth mom Deanna Micoley. The comedian adopted Chelsea in 1997.

“Chelsea made a decision when she turned 18 that she wanted to go to her birth mother,” another source previously told PEOPLE. “This was her choice.”

O’Donnell, 53, pleaded for the public’s help last week after Chelsea disappeared and revealed her daughter suffers from mental illness. Police found her in the New Jersey home of alleged heroin addict Steven Sheerer, a 25-year-old man who is now charged with endangering the welfare of a child and sending a minor a nude photo.

Though her rep Cindi Berger said O’Donnell has a “good relationship” with Chelsea, the source tells PEOPLE that the high school student didn’t like it when her classmates discussed her famous parent.

“She was always pretty quiet, but she hated if anyone brought up her mom,” the source says.

RELATED VIDEO: Rosie O’Donnell Responds to Question About Daughter’s Disappearance: ‘No Mom Is Perfect’

“No mom is perfect,” O’Donnell tweeted Aug. 19 in response to a fan’s question. “We all do our best.”