"Turkey has requested consultations under Article 4 of Nato's founding Washington Treaty," she told Reuters.
"Under article 4, any ally can request consultations whenever, in the opinion of any of them, their territorial integrity, political independence or security is threatened."
Turkey wants to be sure of the strongest backing once it decides its official response, reports the BBC's Jonathan Head in Istanbul.
The government has promised that it will be strong, decisive and legitimate, and that it will share all the information it has with the public.
Earlier, Foreign Minister Ahmet Davutoglu became the first senior Turkish official to challenge Syria's account of the downing of the jet.
After lengthy meetings with military chiefs, he told TRT state television that the unarmed jet had "momentarily" entered Syrian airspace by mistake on Friday but had left when it was shot down 15 minutes later.
"According to our conclusions, our plane was shot down in international airspace, 13 nautical miles (24km) from Syria," he said.