Who is Violet from Don't Let's Go to the Dogs Tonight: An African Childhood and what is their importance?

Violet is the Fuller's black maid at Robandi, who is savagely stabbed by her husband, July. Violet is near death when the Fuller's discover, but Mum's quick first aid saves her life. Although the Fullers are told that she survived and returned to her home village, they never see her again.