Dyhemia Young, whose nickname is Malaysia, had last been seen around 6 p.m. Saturday near Page and Buchanan streets.
Police were concerned for the safety of the girl, a student at KIPP San Francisco Bay Academy who lives in the Bayview District.
But Gittens said this morning that Young contacted a police investigator Sunday night.
"She says she's OK," Gittens said. "Hopefully by the end of the day we will have made face-to-face contact.
Police now consider Young to be a runaway.