She didn't want to 'give full vent to' her feelings. [=let her feelings out completely]
She 'vented' her frustrations by kicking the car.
She needed to find a 'vent' for her frustration.
(..) Where do you meet Polyakov? Hey, hey! Dog, dog, be quiet! What is this? Who are you? - What are the safety signals? - The air vent. Open and all's well, closed and you're not to enter. And the microphone? Peter? The boy stood on the burning deck (..)2011 Tinker Tailor Soldier Spy