The plane was found later with the pilot and three other passengers dead.
The girl was taken to hospital with non-life-threatening injuries.
Associated Press quoted the Federal Aviation Administration as saying air traffic controllers had lost contact with the Piper PA-34 after the pilot reported engine problems.
About 30 minutes after the plane lost contact, a resident of Lyon County called police to say the girl had walked to his home to report the crash.
Sgt. Dean Patterson of the Kentucky state police told Associated Press: “This girl came out of the wreckage herself and found the closest residence and reported the plane crash. It’s a miracle in a sense that she survived it, but it’s tragic that four others didn’t.”
He said the plane had been heading for Illinois from Florida and had crashed in a wooded area near a lake.
The girl’s relationship with those on the plane was not immediately known.
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