Don't worry about what she does. Only worry about what you do and what you can control. Let her go do whatever it is that she wants and act as if you don't care. Confronting her on these issues will not change her mind. That has to come from inside her. I too obsessed about what my W was doing for too long and it hurt my sitch even more. Walk away. Let her go.

God grant me the serenity to accept that which I cannot change,
To change the things I can,
And the wisdom to know the difference.

Hang in there.