An expository article is usually about explaining something or talking about it. So if it's a true story and you write it like a life story then yes it can be. If it's just a fictional story you want to write then no.
<em>A young woman overcomes obstacles and realizes she should be a musician </em>is not a suitable topic for an expository text because it refers to a person's life. This topic can be part of a ficticious story , so it will not suit an exposition. An expository text is used when the writer resorts to facts and defines them. The main purspose of this type of texts is to clear facts up for the reader, who , as a resul of reading the text, will learn some new things.
