The girl's mother called Hereford & Worcester Fire and Rescue Service (H&WFRS) at around 3.25pm this afternoon (Friday 28 January) after her daughter pointed out the fire to her.
One pump from Droitwich attended, and on arrival, firefighters found a shed between two houses alight and houses either side of it involved in the fire.
Watch Commander Craig Newman said: "Thanks to this little girl, we were at the scene very quickly and the fire was under control within around 20 minutes. The shed was completely destroyed and there was also damage to both houses either side of it.
"We really feel that this fire had the potential to be far more serious than it was, especially as there was a gas cylinder nearby which could easily have caught fire and exploded.
"The family can be very proud of their young daughter!"
He confirmed that no one was injured as a result of the incident.