Answer:
It breaks the iambic rhythm on the first two syllables, setting the demanding tone of the line.
Explanation:
Just did the assignment and it was right. :)
Precisely the author keeps the interest of readers not describing clearly the kind of relationship in Giselle's family. By doing this, readers had to imagine and assume how it was. Instead, the author described better scenes with Dark Star and the influence of books about horses in Giselle's life and actions. Also the fact that she broke her arm but not referring to it in detail leads the readers to imagine and guess what could have occurred.