It seems a lesson that keeps coming back to me lately is - it's not about you. People are just so fucking variable and filled with their own inner systems and strangeness. Who knows, maybe someday she'll even share with you what it was. But for now, it's admirable (and frankly great for you, because who has time for toxic grudges, aanyway) that you went on that walk.
Are you gonna try pilates when and if schedules align? :O