It's heartbreaking to see a mother's desperation over the auto immune disease of her daughter. The pain is hard to express, the feelings you didn't share and the mishandling that stemmed from you not speaking at times not knowing what to say. Whether you wish you had said something or reflect on the situation, comforting comes to one magical thing called hope. 

Hope is an identity. You can't see it, you can't touch it, but you can't live without it. It is the most effective comfort tool to offer even when there's nothing to say.