Manhood, the practice of NC and blocking people is used specificlly when someone is trying to either get over someone, or trying to help someone else get over them.
If you still have feelings for her and want to be with her again, there is really no reason to block her. But it might be good to give her the space she wants. You also might want to consider moving on yourself in case she doesn't want to rekindle things with you.
“Inside every cynical person, there is a disappointed idealist”--George Carlin