I don't recognize this Minnie, and based on its appearance, I'm inclined to think this is a homemade craft doll or an unauthorized item. The doll is a bit "off-model" for it to have been made by a toy manufacturer. If I'm right, the value of the piece is going to be an "eyes of the beholder" situation, and probably fairly nominal. Even if I'm wrong and she's a commercial toy, I wouldn't expect her to be worth too much except as a toy that a young girl would love. Good luck!