What about the Little Bo Peep from the two Silly Symphony cartoons Mother Goose Melodies and Old King Cole (and impersonated by the Big Bad Wolf in Three Little Wolves and Katherine Hepburn in Mother Goose Goes Hollywood)?
It's actually the one from Toy Story, after all. Once season 4 finished, cast members were given gifts along with a card featuring the Disney-fied versions of Season 4 characters.
Bo Peep is represented by her Toy Story counterpart.
Here's the link.
Her Toy Story counterpart is an object, not an human an was probably choose for the Disney-fied versions of Season 4 characters, only because it was her most known version...
But it's still the one the creators identified with the character, meaning it's the one that correlates to her.
The Silly Symphony character is directly the nursery rhyme character (Disney in-universe).
The Toy Story version is only an Toy, whom it creation was inspired by the nursery rhyme. Also, this version definite herself like a toy and notlike the original.
Concerning the card, the Toy Story character was used only because she is the most iconic version.