The incident happened Aug. 10 in the 1300 block of Monroe Street, Herndon Police said.
The girl, 16, entered the home of a man she knew without his permission.
After a physical altercation, “the suspect exited the home, picked up a gas can, poured gasoline under the deck and onto a wheelbarrow,” and then “ignited the wheelbarrow,” according to the police report.
The fire was extinguished and caused less than $200 in damage.
The teen was charged with unlawful entry, assault, threat to burn and unlawfully setting a fire. She is being held at the Fairfax Juvenile Detention Center.