snapped her fingers shut
At the porch, she hesitated. Yellow tape fluttered at the door. The windows were boarded up.
Elizabeth touched flaking paint and thought of all the things that had died on the other side of the door.
Five days, she told herself. I can handle this. But her hand shook when she reached for the knob.
She stared at it, disbelieving, then snapped her fingers shut. She stood for a long minute, then
What does "snapped her fingers shut" mean?
What does "retreated in disarray for the first time since pinning on a badge" mean?

