What in the "Cinderella, the legend"story suggests its origin. according to the author? Why is her theory uncertain?

What suggests the origins of "Cinderella, The Legend" is the fact that she had tiny feet what was considered of erotic significance in the Orient (ancient times). Hence, it could have been originated in Orient.

Anyway, her theory is uncertain because Cinderella, due to its popularity among boys and girs, is the fairy tale that has at least 345 documented variants and many more unrecorded versions.