This document discusses the difference between subjective and objective pronouns and provides examples of when to use "she" versus "her". Subjective pronouns like "she" serve as subjects, while objective pronouns like "her" serve as objects. Using the wrong case can result in ungrammatical sentences. An easy trick to determine the correct case is to temporarily remove other nouns in phrases and see which sounds right on its own. Using the proper pronoun case avoids sounding uneducated and improves one's grammar.