Compare the portrait of Sally to that of Marin in The House on Mango Street.
Marin sells Avon products and babysits to save up money while she waits to return to Puerto Rico to marry her boyfriend. Esperanza notes that Marin will be sent back to her mother. Esperanza doesn't want Marin to leave because Marin is like an older sister and usually has gossip to tell. Marin makes it a point to sit outside so boys notice her and Esperanza supposes that Marin is not just trying to get attention; she's hoping for something dramatic to happen:
Marin, under the streetlight, dancing by herself, is singing the same song somewhere. I know. Is waiting for a car to stop, a star to fall, someone to change her life.
Like Marin, Sally is noticed by the boys. Sally is very beautiful which her father thinks is trouble. In a later chapter, we learn that Sally's father is domineering and beats her. Like Marin, Sally teaches the girls - how to use makeup (like an older sister). Some kids at school, mostly boys (and Sally's ex-friend Cheryl) say nasty things about Sally which Esperanza does not want to believe. Sally goes home right after school, presumably because her father is so strict and she is afraid of him. Esperanza supposes that Sally, again like Marin, wishes for some type of escape, some hope of a better life:
Sally, do you sometimes wish you didn't have to go home? Do you wish your feet would one day keep walking and take you far away from Mango Street, far away and maybe your feet would stop in front of a house, a nice one with flowers and big windows and steps for you to climb up two by two upstairs to where a room is waiting for you.