Rosey is an enchanted rose and Miss Nettle's companion who appears in the Sofia the First episode "The Enchanted Feast".
Background
How she and Miss Nettle met remains unknown but she accompanied her to Enchancia where they planned to steal Sofia's Amulet. She is first seen around Miss Nettle's left wrist and magically overgrows all over the castle trapping everyone except Sofia, Cedric the Sorcerer, Wormwood, and Clover.
After their defeat, Rosey escapes with Miss Nettle, and they fly away from Enchancia.