Ah yes, it's tough when they are in the same house. You don't get a chance to take a break from all of it and it stays in your face. Are you better with or without her there?
IMO, she is home which in her mind that means she is trying. Remember what my H said to me when I asked him if we could try? He said 'I thought that's what we've been doing' and I said 'just that fact you're here means you're trying?'
As for email with OM? unless you know what she was saying leave it go. She will have contact with him as he is the father of S. She also has the withdrawal period and depression to muddle through.
Be patient, be strong, be her best friend.
Live your life while you are still living. Riding the trail less traveled.
