Who is Reverend Mother Schwangyu from Heretics of Dune and what is their importance?

Reverend Mother Schwangyu is the small, skinny, wizened old commander of the Bene Gesserit Keep on Gammu, Schwangyu stands unilaterally opposed to the training of gholas after eleven failures. Curt and abrupt, Schwangyu keeps to herself more than most Reverend Mothers. Faced with the deadly challenge of the Honored Matres, Schwangyu believes the Reverend Mother Superior Alma Mavis Taraza is crazy to be "dallying" with the ghola.