Mischa Barton’s Estranged Mom In The Dark About Disturbing Meltdown

Mischa Barton was hospitalized for a mental evaluation on Thursday when her disturbing behavior forced neighbors to call police. RadarOnline.com can exclusively reveal that the actress’ estranged mother is unaware of the bizarre incident.

“I’m sorry, I don’t know anything,” Nuala Quinn-Barton exclusively told RadarOnline.com.

Barton, 31, was reportedly seen in her backyard hanging over her fence while ranting about her estranged mother.

Although initial reports claimed The OC actress was wearing only a dress shirt and tie during the meltdown, Sgt. Duncan told RadarOnline.com she was “fully clothed” and was “speaking incoherent statements” when deputies arrived at 7am.

Barton was rushed to the hospital voluntarily. She was previously held on an involuntary hold in a hospital in 2009, but she insisted it was just a bad reaction to wisdom tooth removal.

A source told RadarOnline.com how the actress has been on a downward spiral for years.

“Her attempts at getting healthy have always failed,” the insider said. “She took on Dancing With the Stars to make some money and try to clean up her act – but that didn’t help.”

The insider told RadarOnline.com how the troubled actress was “doing mushrooms” at a dinner party.

“Then, just two weeks later, she was at a bar in NYC and smoking pot and doing coke,” the source claimed. “She was openly using her hand to snort coke off of in this tiny space.”