The Female Ranger is a character in Monsters University. She appears, along with her co-workers, during the film's climax.
After Mike Wazowski fails to scare a cabin full of little girls attending Camp Teamwork as a result of him getting into an argument with Sulley for catching him cheating in the Scare Games by secretly tampering with team Oozma Kappa's scare simulator controls and subsequently breaking into the door lab to prove himself that he's a scary monster, Mike runs out of the cabin frightened and ashamed to a nearby lake where he starts lamenting about how and why he can never become a scarer at all after the girls start to rally up on him. When Sulley runs into the Human World with the other OKs distracting the staff, he finds the entire cabin completely empty and all of the campers evacuated due to an "alien sighting."
The practical, pear-shaped officer inspects the cabin along with her squadron while Mike and Sulley hide in the rafters above the cabin and pull off every scare technique on them (in hopes that scaring the rangers can potentially create enough scream energy to power the door from the human world). They occur first with playing a record player backwards, to winding up a clockwork doll, to knocking over the bunk beds as if they were dominoes. As the female ranger nervously radios for backup, Mike ties a fishing line around their legs. This causes them all to trip before finally giving Sulley the signal to jump down and roar at them. Being adults, their screams were so loud that it literally caused the door to power on its own even though its station isn't. Once the rangers run away in terror, Mike and Sulley can finally escape.