I hope and pray that she will press charges and he's locked up for a long time. There is no way that she hit her head accidentally. I can't even imagine the physical, emotional and mental pain she is experiencing. I am keeping her in my thoughts and prayers.
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.