She had a joyful expression on her face.

She couldn't contain her joyfulness when she received the good news.

The children's laughter filled the room with joyfulnesses.

Her face was filled with joyness when she received the surprise gift.

The Joyes are coming over for dinner tonight.

Her last name is Joye.

She danced joyfully across the stage.

She had a joyfull expression on her face.

She is feeling joyfuller today than yesterday.

She is the joyfulest person I know.