First, don't ignore the situation - make an effort to be friendly and handle the confrontation politely. Even if things didn't end on a good note, it's in your best interest to be the bigger person and show that you're willing to let your grudge die.
Next, don't bring up any personal topics that may pertain to why your relationship deteriorated. Instead, try to keep the conversation light until you can end it and move on.
Finally, consider speaking to a psychic if you're interested in finding out what happened to your friend after your relationship came to a conclusion. If there was an ample amount left unsaid, live psychic readings can help you find out how your ex-friend truly feels about the situation. In the end, you may decide to give her a call to mend the friendship.