Rockview police say the girl was going from house to house along Nittany Valley Drive in Walker Township selling fast food discount cards for $10.
The fake cards are red, white, and blue with a picture of the United States in the middle and fast food logos around the edge.
The girl is about four feet tall with dark brown hair and blue eyes. She was last seen getting into a silver Dodge minivan with an older woman with dark brown hair.
Police are asking anyone who may have purchased a card to call PSP Rockview at (814) 355-7545.