I wonder if it would be a bad idea to just ask her. You two seem to be in a place where you can talk like this. How about telling her how conflicted you feel, that you want to mark the occasion but it's obviously not your happiest anniversary. See what she thinks about it?
Yes I like it... Simple yet to the point.. Maybe we can each do our no strings attached dates then... Like a no strings attached anniversary..
Me - 30 W - 28 M 4 t 6 ILYBINILWY #1 Jan - 2011 Band-aid Jan 11' ILYBINILWY #2 7/28/12