Who is Veronica from Girls at War, and Other Stories and what is their importance?

Veronica or Vero is a poor Nigerian girl who loves primary school for the one term she attends before the government runs out of money to subsidize education. Her mother Martha eventually hires her out as a nanny to the Emenikes, who imply they will send her back to school when their child not longer needs care. Vero clings to this promise for months as she takes care of the children, singing them songs about school. Mr. and Mrs. Emenike are charmed by her.