That's a lot of time passed. I cannot imagine she'd be anything other than pleased to hear how much you valued her instruction. Usually, after some time away from a bad experience, people will sift out what good came out of it and let the bad stuff go, well at least people who do not have ulcers or thrive on being unhappy. I personally think that a phone call would be the appropriate way to go. Sure there might always be the food elephant in the room, but if you approach it strictly from a training standpoint, I don't see why you couldn't re-establish your relationship with her as an instructor. Heck, if she is still ****ed about what happened after 8 years, I'm not sure I'd care about weirdness at future shows.
You just have to see your distance...you don't have to like it.