In an Instagram story that Anna posted, she exposed Kris Letang for potentially stalking her Instagram, though there is not much proof of that being the case, other than him viewing one of her stories.
It seems as if Anna is calling out Letang's wife for sleeping with married men. We do not know what inspired Anna to do this, but she is most definitely stirring the pot with something that isn't her business.
Could Evander Kane have had a past with Letang's wife, is Anna Kane not over Evander, and seeking more attention? This is all purely speculation.