text: First off, in an disagreement, keep hold of your temper.  Try to reason with her without raising your voice.   Try to negotiate a compromise.  Before she can threaten you with taking something away, try saying something like, "I would really like to move this vanity somewhere else so that I can make room for a desk.  I know you don't want to, so why don't we make a trade? I'll do something you want in exchange for this favor."  This will demonstrate that you are mature and are considering her feelings and wants too.  It used to work with my mother.