One way Gregor's family earns money is that they all get jobs. His father is working as a bank messenger, his mother gets a job sewing, and his sister is working as a salesgirl. They also do other things like sell all of the jewelry in order to make some more money to pay for their apartment.
Start a conversation with complimenting her then start from there try to be as nice as possible as you can then say your sorry for whatever she hate you about then become friends