Abu Bakr al-Baghdadi was targeted by US special forces last month (Picture: US Department of Defense).
Rasmiya Awad was detained in the town of Azaz, suspected of being affiliated with IS, in a Turkish-controlled area of northern Syria where she had been living with family.
It is understood that she was captured yesterday evening trailer container with her husband, daughter-in-law and five children.
Adults in the group are being interrogated, according to the Turkish official.
The official has also called the arrest an intelligence "gold mine", claiming it will help Ankara to "catch more bad guys" in an overt campaign against IS.
Turkey's communications director has taken to social media to confirm the events, describing the arrest as a "success".
Turkey has been criticised for its recent campaign against the Kurdish-led Syrian Democratic Forces in northern Syria - territory it now controls.
A ceasefire deal with Russia secured a border-zone in northern Syria, free from the Kurdish militia fighters it considers terrorists, after the US decided to withdraw from the area.