"Break" means one of three things, generally speaking:
1) I want to break up...but I don't have the balls to actually do it
2) I like you and all, but I want to ******** other people.
3) I am totally messed up right now, not worthy of or ready for a relationship, and need to work on myself without worrying about you or "us."
What all of these things have in common is that you have no control over the break(up) portion of it. You can only control your reaction. None of us know this chick, so we can't determine which is the most likely cause. The only reason of the bunch that is worth a s**t (depending on the circumstances) is the third one. Even so, that early into a relationship needing a break is a bit concerning.
From your last post, it sounds to me as if she either A) wants to break up but doesn't want to be the bad guy or B) has some deep seated emotional and/or self-confidence issues.
Regardless, the two of you are for all intents and purposes broken up. If you want to push another conversation with her to try and get more clarification, that's fine, but don't come off as needy.
For the time being if you can't get some immediate resolution to the situation, move on and look elsewhere. Keep her as a friend, or don't - that's up to you. Maybe it'll pan out further down the road, maybe it won't. Either way, don't let the break thing string you along. The situations where "breaks" are even remotely justified, let alone actually work out are few and far, far between.
Best of luck! heart