Hmm...Just from someone who's starting to feel like this in a relationship with an ENFJ, I think I can see her side of it. I don't know what to say except that she probably is having issues of her own and a relationship with someone who comes on as strongly as an ENFJ was just the breaking point.
Just giver her some time and space, and realize that it was probably hard for her to break things off (even if she did do it in a hurtful way), but at least she had the strength to do so instead of deceiving you with something she wasn't feeling.
I know from personal experience that one can feel so, so guilty being constantly showered with love by an ENFJ when their own feelings just aren't that strong. Maybe the feelings are there, but they're just not as strong (if she's a Thinker, it might be a bit soon for "love," too) and she started to feel trapped and needs some time to sort them out.
I wouldn't blame either of you in this situation, but if she's said anything unkind, I really am sorry. =/ But at least she did the honest thing!