Quiana Coronado, 9, said she was doodling by her living room window when she saw a man outside approach an elderly couple and run off with the woman's purse, WISN-TV, Milwaukee, reported Thursday.
The girl said she quickly filled her parents in on the situation while keeping an eye on the purse-snatcher's direction and she gave chase with her father in the family truck.
Coronado was able to point out the suspect a few blocks away and he was detained with the help of neighbors until police arrived.
Police praised the young girl for her actions.
"She's doing the right thing. She goes and tells her parents and her parents then take action," Milwaukee police Lt. Alex Ramirez said.
Coronado said the incident may have been a glimpse into her future.
"When I grow up I want to be a cop," she said.