She is used to refer to the subject and her is used to refer to the object.

In English, she is a pronoun used to refer to a woman or a female animal as the subject of a sentence. She is also a pronoun, which refers to a female or a female animal as the object of a sentence. The key to distinguish her from hers is to pay attention to their roles in the sentence. She appears as the subject, and she appears as the object. This distinction can help us to use these two pronouns correctly.