You shouldn't sabotage your roommate's life.
Wendy is roommates with Sandra, and the two do not get along at all.
Wendy wants to get away from Sandra.
Wendy looks for a new apartment that she doesn't have to share.
Wendy calls Sandra's work and tries to get her fired, so she has to move out.
Wendy no longer has to put up with Sandra and is less stressed.
Sandra finds out about Wendy's plot and kicks her out of the apartment.