Why would Barbie not need her own convertible? This has a stylish pink colour and can seat two Barbie dolls at the same time.
From OnBuy
Barbie DVX59 ESTATE Glam Convertible Pink Toy, Plastic Sports Car for Doll Vehicle
The Range
Convertible Pink Cruiser - Hot Pink
Robert Dyas
Barbie Autre Glam Convertible Sports Toy Vehicle For Doll Pink Car