The teenager, who has not been named, left her home in Saint-Brice for a run in the forest at about 4pm on Monday local time.
Her phone and GPS watch were found along her running route, with traces of blood.
A search was launched, but the girl was not found until she was next seen at a kebab shop in Sable-sur-Sarthe, at about 8pm on Tuesday night, allegedly in a state of shock.
French media reported that she said she had been seized by several kidnappers.
Police had opened a kidnapping inquiry before she reappeared.
A man was arrested on Wednesday but released without charge.
Witnesses told French media that girl had “a bit of blood on her” and that she had escaped a vehicle before seeking refuge in the kebab shop.
Investigations are continuing.