Sofia the First (2013)

S2E18 The Curse of Princess Ivy

Amber stumbles upon Sofia's amulet and, without asking, decides to take it for herself. Unbeknownst to her, the amulet holds magical powers, and her actions accidentally awaken an evil princess named Ivy. Ivy has her sights set on conquering Enchancia, posing a new threat that Amber must now face.