How does Donna react to Brian's initial phone call? How does her reaction compare to Ralston's characteristics?

When Brian calls Donna to tell her that her son is missing, she is first silent. Donna never panics on the phone and is rational from the start, as if she is waiting for this phone call. Right away, she asks Brian what steps he takes and what needs to be done next. She is a rational woman who handles herself well in emergencies. Ralston shows he has the same abilities when he is stuck in his own emergencies by thinking things through.