Who is Oh-Be-Joyful, Mamanowatum, Anne from Mrs. Mike the Story of Katherine Mary Flannigan and what is their importance?

Oh-Be-Joyful, Mamanowatum, Anne is the fifteen-year-old Indian girl who Katherine brings home from the Mission to help with the baby and housework. Oh-Be-Joyful is in love with Jonathan, a proud and tenacious Indian of whom the sisters at the Mission do not approve. The sisters want to keep Oh-Be-Joyful away from Jonathan because they do not want for her to end up a klooch. Klooch simply means Indian woman. However, the Indian men are known to make the women do all the heavy lifting and to beat their women. This is against what the Mission stands for. The Mission names Mamanowatum, which means Oh-Be-Joyful in Indian, the new name of "Anne" because they name all of their orphans after saints in hopes that they will do the right things in life.