Sophie was the shopkeeper and an NPC in Adopt Me! who sold clothes/cosmetics for Dress Up. Players could find her in the Clothing Shop. However, after the Dress Your Pets Update, The Clothing Shop was removed from the Adoption Island and was replaced with a Premium Plot space.
This was what Sophie said when players spoke to her.
"Hey! I'm just so glad you guys came in here! If you want anything fabulous you're in the best place to look totally fab!"