Nouns ending in -ée are usually feminine.
The suffix often marks a duration or contents.
Is fée masculine or feminine?
lafée
The rule behind it
91.7% of -ée nouns are feminine
In context
Je ne crois pas aux contes de fées.
I don't believe in fairy tales.
La fée a changé le prince en chat.
The fairy changed the prince into a cat.
Ses pas étaient aussi légers qu'une fée.
Her footsteps were as light as a fairy's.