You really have to stop letting her emotions get to you HD. I know its difficult, I do the same but only when its the other way around. When W is nice and happy to me are my difficult days. We have to remember, this is about them not us. Her anger directed at you is likely her own insecurity coming out.

Yes, she had the A, she broke up the M. She knows this on some level. So she looks at you being the pillar of strength for the family doing everything you can right and it pisses her off. Not because you are doing anything wrong, but she is. She cant take that anger out on herself, so who can she? She brings you down and it makes her feel better.

This is just one possibility to where the anger comes from, it could also be another reason. Regardless, the anger comes from her own insecurities and whats shes doing. Understand her emotions are mostly about her and you remove its power over you.

Accept what is, let go of what was, and have faith in what will be