Who is Thelma Mothershed from Warriors Don't Cry: A Searing Memoir of the Battle to Integrate Little Rock's Central High and what is their importance?

Thelma Mothershed is one of Melba's closest friends. She is described as petite and pale. Thelma wears thick, horn rimmed glasses, and she suffers from a heart condition. She is one of the students integrated into Central High School.