Well, if she wants a clean break, then she wants to be done with the relationship entirely.
If she wants a 'break for space', then she wants time to think over the relationship and to collect her thoughts, to view it from a different perspective other than the one where you are with her all the time. She wants distance from you to be able to know whether or not she misses you and whether or not the relationship will work out, or what she really feels for you.
But if she didn't say anything about just taking a 'break', then she wants to break up. A 'clean break' would mean to break up with no time for her to think- she's done.
She may have said that she needed space to make the blow a little less painful.
Sounds to me like she wants to break up.
But she may be confused and not know what she wants, since she seems to keep saying things like 'i need space' and 'i love you'. Of course you can still love a person and want a break from them.
If I were you, I would just go ahead and let her have her space and then contact you when she wants to talk with you again, or knows what she wants from you.