The two men had quarrelled over a five-franc note. For the five-franc note she should substitute a young lady, which would raise the tone of the tragedy, and at the same time furnish an excellent plot.
Killing somebody over a five franc note is a more tragic story. It's one that speaks to class struggle-- and therefore over Miss Lavish's head. Her dramatized version is not only unoriginal; it flattens and trivializes