Of course, she was thinking about being a missionary to the other side of the world or making huge sacrifices in some other significant way of service.
The Lord told her that He wanted her to be in charge of a group of people , none of whom the world thought very important, and that she would not get paid or noticed. She eagerly agreed and wondered where He was sending her. He told her it was where she was already. At home.
Her "people group" was her children.
She was disappointed.