Daphne is first mentioned during Order of the Phoenix, and many fans assumed that she was part of Pansy Parkinson's "Gang of Slytherin girls" that was mentioned several times previously.

Both sisters came from a pureblood family and Daphne was even in Draco’s year in Slytherin, but took a backseat to the main plot of “Harry Potter.” But because Daphne was never developed by ...