Vintage 2002 Mattel Barbie McDonald's toy <3

Dates from 2002, either never used or only lightly used, originally came from a McDonald's happy meal, is out of it's original packaging so this listing is just for the loose toy, there's a slot on it but i'm not sure if there's a piece missing or if it was just designed that way if it's the former there's a piece missing, the button on the side is stuck but i'm not sure what it's supposed to do, and is in good condition.