First off, although the comment may have been insensitive, you have to ask yourself something. If she is immature enough to end a relationship for something as common as saying the wrong thing sometimes, then is she really mature enough to be your friend? and does she actually hold you in as high regard as you do? Hmmm.. I'm sorry but my friends say stupid things that offend me badly sometimes, but if they are truly great friends then it goes without saying I'm not going to cut them off so quickly.

So... things to ponder above. Outside of that it's really just a wait and see thing. She has the chance to show you if you are truly a friend or ever were or not, and you'll see in time, but you can't really do any more other than being apologetic which it seems you already have been. YOu made the mistake, you tried to make amends, you did your part. The rest is on her. I know that's not easy but it's what you have to do, and that is, wait,.