Cecilia Hunter
From Tardis Wiki, the free Doctor Who reference
Cecilia Hunter was the best friend of Kate Stewart during her time in Reading. She shared a house with her in 1989. She was attracted to Malik Khan, unaware that he was gay. (PROSE: Of the Future)
Cecilia and Kate remained life-long friends, and by 2004 she had married Alex Reardon and bore a son, Jacob, who had learning difficulties and lacked an understanding of social skills. When Gordon and Conall were kidnapped, Cecilia offered Kate words of comfort. (Downtime: Child of the New World)