The girl is from a poor family and that we can guess from the dress she is wearing. She has large eyes which have a sad expression. The waitress says that she comes to the restaurant only on Saturdays for her lunch because Saturday is the pay day. On the other days she does not take lunch because she has no money. She is working in a nearby shop, maybe for a very small pay. As she is a teenager nobody would hire her for a big salary.
