She was taken to a nearby hospital for an examination, police said.
Nicole Ryan’s mother told authorities that she saw her daughter in her bedroom about 1 a.m. Wednesday, but when she checked on her about two hours later, the girl was gone.
Authorities searched the home in the 8800 block of Oakdale Avenue and canvassed the neighborhood but had not found the girl.
Police called in the FBI and brought additional resources from across the San Fernando Valley to help search for Nicole. Helicopter media footage showed the barefoot girl being led into an ambulance. She was wearing a white T-shirt instead of the black shirt she was last seen wearing.
LAPD Cmdr. Andy Smith said there was no sign of forced entry, but the back door of the home was unlocked and a side gate was open.
The girl was found about six miles from her Northridge home at a Woodland Hills strip mall near Starbucks.
For the record, 4 p.m. March 27: A previous version of this post incorrectly stated that the girl was found in Canoga Park. She was found in Woodland Hills.