"The woman had gone down on her knees and was shuffling slowl..." — Graham Greene quote meaning

The woman had gone down on her knees and was shuffling slowly across the cruel ground towards the group of crosses: the dead baby rocked on her back. When she reached the tallest cross she unhooked the child and held the face against the wood and afterwards the loins: then she crossed herself, not as ordinary Catholics do, but in a curious and complicated pattern which included the nose and ears. Did she expect a miracle? And if she did, why should it not be granted her? the priest wondered. Faith, one was told, could move mountains, and here was faith--faith in the spittle that healed the blind man and the voice that raised the dead. The evening star was out: it hung low down over the edge of the plateau: it looked as if it was within reach: and a small hot wind stirred. The priest found himself watching the child for some movement. When none came, it was as if God had missed an opportunity. The woman sat down, and taking a lump of sugar from her bundle, began to eat, and the child lay quiet at the foot of the cross. Why, after all, should we expect God to punish the innocent with more life?