Hahah, FER SHURE! And probably more than a tad!

I agree with the others that you did what needed to be done and have nothing to feel guilty about. I think that dark_heart hit the nail on the head -- that she used the "cry and go home" as a sympathy tactic. Which I'll put even more bluntly: a manipulation tactic. It's something I've had to learn to deal with and really only recently been able to hold my own against. The key was seeing it for what it was. Only by gaining a more objective viewpoint of the dynamic have I been able to keep from being sucked into the whole guilt, pity and cave thing. Which is good, though it can be a real challenge for kind-hearted people such as yourself. Thing is, when you don't stand up to it, it only happens more and before you know it, they've got you over a barrel (or so it feels by the pile of precedents). So it is VERY good that you spoke up when you did.
It wasn't going to get better by itself.
You did the right thing.