Three of them were in serious condition, Yerlikaya said. Emergency rescue teams are trying to reach the four people left under the rubble.
The incident was a stark reminder of the fragility of parts of Istanbul's residential infrastructure, with several buildings collapsing in recent years. The girl was the second child to be found in the rubble after the 9-year-old boy that was rescued earlier.
Initial footage from the incident showed people being pulled out of the rubble as crowds surrounded the site.
Murat Kurum, the environment and urbanization minister, told reporters at the scene that some apartments had guests at the time of the collapse, without providing details.More news: Kurtis Blow Blasts Virginia AG Mark Herring For Blackface "Tribute"
Yerlikaya didn't say how many people remain unaccounted for.
According to the governor, the top three storeys of the building had been added illegally. "We are continuing with our search and rescue efforts so that we can deliver good news [about survivors]".
Twelve people have been rescued from the rubble of the building that collapsed on Wednesday in Istanbul's Kartal neighbourhood, south of the Aydos Forest, on the Asian side of Turkey's largest city, Efe news reported.
At least three people were killed in the disaster, and another three were critically ill in hospital.More news: Ariana Grande premieres new album thank u, next: Stream
The building had 14 apartments with 43 people registered as residents.
According to Istanbul Governor Ali Yerlikaya, Tekgoz was rescued under the wreckage after almost 18 hours.
"Provincial authorities are in the process of identifying them and. action will be taken against buildings that carry risks", he said.
Yerlikaya also said there was a textile workshop on the ground floor that was operating without a licence.More news: Top US envoy returns to South Korea after North Korea visit