Who is Wu Chun-mei from Chinese Cinderella: The True Story of an Unwanted Daughter and what is their importance?

Adeline's best friend, Wu Chun-mei, was the mosy loyal and valued friend that Adeline had. It was Wu Chun-mei, who nominated Adeline to be class president.... and when she won the election, Wu Chun-mei arranged for everyone to bring gifts to Adeline's home in celebration.