Because of course she had known she must go. She always did the thing because in obedience lay the integrity that God asked of her. If anyone had asked her what she meant by integrity she would not have been able to tell them but she had seen it once like a picture in her mind, a root going down into the earth and drinking deeply there. No one was really alive without that root.
...there began to come to her a first dim realization of God's humility. Rejected by the proud in His own right by what humble means He chose to succor them; through the spirit of a child, a poor gypsy or an old man, by a song perhaps, or even it might be by the fall of a leaf or the scent of a flower. For His infinite and humble patience nothing was too small to advance His purpose of salvation and eternity was not too long for its accomplishment.