How has pregnancy affected Rose of Sharon?

From the text:

"For Rose of Sharon was pregnant and careful. Her hair, braided and wrapped around her head, made an ash-blond crown. Her round soft face, which had been voluptuous and inviting a few months ago, had already put on the barrier of pregnancy, the self-sufficient smile, the knowing perfection-look; and her plump body—full soft breasts and stomach, hard hips and buttocks that had swung so freely and provocatively as to invite slapping and stroking—her whole body had become demure and serious. Her whole thought and action were directed inward on the baby. She balanced on her toes now, for the baby's sake. And the world was pregnant to her; she thought only in terms of reproduction and of motherhood."