How does Sally fail Esperanza in the vignette "Red Clowns"?
Sally tricks Esperanza into riding the tilt-a-whirl when Esperanza does not want
to.
When Esperanza calls for Sally to help her, Sally does not come.
Esperanza trusted Sally, but she realizes that Sally and the boys have been
making jokes about her behind her back.
Sally promises Esperanza that she is going to start making better choices, but
she doesn't actually change at all.