we've been trying to get the name of a film but can't workout what it was called please help.

there was a female character who i think was a copy girl in a publishing company, the other girls nicknamed her Mouse. her boss i think bumps into her one day and she says something like if i killed myself tomorrow nobody would notice.
The next day she does not show up for work,and her boss goes looking for her, he finds out she went to see a sick friend in a slum type ghetto.

Any ideas we can't even think who the actor/actress was.