When she moved into her apartment, it was now haunted by the evil ghostly Maude Pearson who harassed and insulted her.
She was a very beautiful and popular girl, whose fashionable clique was nicknamed the "Cordettes" and included Cordelia's best friend, Harmony Kendall.
His later attempts to punish her through magic resulted in every woman in Sunnydale except Cordelia falling murderously in love with him.
Cordelia was so moved by how Xander was going to use magic to make her fall in love with him that she made amends with him, giving up her popularity to be with returned to Sunnydale and kidnapped Willow and Xander, Cordelia and Oz searched for the two, both falling witnesses to Xander and Willow's kiss.
She discovered that invisible student Marcie Ross was responsible for terrorizing her, and Buffy saved her life when Marcie tried to mutilate her as revenge for ignoring her.
Despite her tendency to rationalize strange events, Cordelia was forced to finally accept the existence of dark forces in Sunnydale when she was attacked by vampires on the night of the Spring Fling.
Cordelia, in a nutshell, was the embodiment of who Buffy was before becoming the Slayer, and became the chief foil at school for Buffy.