Can we just remember, River just lost two of the three people she trusts in this universe. She never got to say goodbye to her father, and she could only kiss her mothers hand goodbye because someone had to watch that angel. The Doctor breaks down, he screams and cries and rages all the while his wife stands composed, thrashing internally with a white hot anger. But she is the Doctors anchor and his rudder. If he wont help himself then she must do it for him. From the very beginning to the end of her life, River has silently sacrificed herself, either physically or emotionally, for those around her. River may have the feistiness of her mother but she has inherited the great burden of compassion from her father.