In Toy Story 3, she believes Andy threw her and the other toys out, she argues with Woody, who tells the other toys that Andy was actually putting them in the attic, none of the other toys believe this until Mrs.
In Toy Story 3, Bonnie's belief is that Andy threw away all the toys, but Woody argues that he was putting them in the attic, and it wasn't until Mrs. [Character Name] that they believed him.