That was such a sad incident last evening, however, I'm glad you were able to help them out. I imagine the kids were scared and hungry. I realize the woman was in labor, but the father should have had some plans in place, i.e., someone to watch the children and ensure that they were fed. So sad.
Maybe when things settle down, you could go over and introduce yourself and have the little girl visit w/your daughter. It would expand her circle of neighbors who could possibly become friends.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.