What act breaks the spell on Pearl and makes her capable of joy?

In Nathaniel Hawthorne's "The Scarlet Letter," Pearl's transformation and her ability to experience joy are catalyzed by her embrace of her mother, Hester Prynne, during the final scenes of the novel. This act symbolizes the breaking of the emotional and societal barriers that have isolated them. When Pearl recognizes Hester's love and accepts her, it signifies a healing moment that allows her to connect with her mother and the world around her, ultimately breaking the spell of sorrow that has surrounded them.