My girlfreind back when she says she wants a break?

You move on. Concentrate on yourself, your friends, your life, not hers! You block all contact. Join the gym, start new hobbies and keep yourself busy.

Give her the break! Don't call or go by her house for about a week. Be unavailable for her if she calls you or comes by. She will see what she is missing and come back if it is meant to be.

Find a good hobbie to occupy you time while you wait!

You don't, you just give her what she ask for. Its her choice. You can sit on your thumbs waiting, or you can accept she is gone and get a life that you enjoy with out her. Nobody knows what the future will be.