This is the 9519th most frequent French word.
décoré
Adorned; decorated.
In this sentence, 'décoré' is used as a past participle to describe the cake having undergone the action of decoration with fruits.
Le gâteau a été décoré avec des fruits frais.
The cake was decorated with fresh fruits.
Here, 'décorée' functions as an adjective derived from the past participle of 'décorer', emphasizing the completed state of the hall's decoration.
La salle était magnifiquement décorée pour la fête.
The hall was beautifully decorated for the celebration.
'Décoré' in this instance is in the passé composé tense that conveys the fact that she executed the action of decorating her notebook in the past.