Do any pixar characters appear in disney princess collections?

Based on the available evidence, there is no confirmation that any Pixar characters are included in Disney Princess collections. The Disney Princess franchise traditionally features characters from classic Disney animated films such as Cinderella, Ariel, Belle, and Moana. Pixar, as a separate animation studio under Disney, produces its own characters and franchises like Toy Story, Finding Nemo, and Inside Out. While both fall under the Disney umbrella, the Disney Princess line specifically focuses on traditional Disney animated heroines, not Pixar characters. Without verified information to the contrary, it cannot be stated that Pixar characters appear in these princess-focused collections.