Shaves,
as far as your W distancing herself from her sister, I think that is all normal. I always try to think of things by putting myself in the others position. She doesn't want to be with you. She has her reasons based on how your relationship was lived from HER point of view. She is done. If you were in the same position where you FELT that way, I'm sure you too would distance yourself from people who were telling you to reconsider your FEELINGS or saying she shouldn't FEEL that way. Remember this process has nothing to do with LOGIC (W, you shouldn't be with anyone else until this marriage is final, you may a vow for better or worse, I will change). This separation/divorce is an emotional decision based on life through their eyes. SHE HAS A RIGHT TO FEEL HOW EVER SHE IS FEELING AND BY CHALLENGING THOSE FEELINGS THEY ONLY GET FURTHER INGRAINED.

Questioning her about her whereabouts or whether or not she was truthful is a bad idea in my opinion. Right now she doesn't need/ want to have trust with you. She doesn't need/want to tell you what she is doing. Detaching...Set her free from your mind. Keep posting here if she is lying or being deceitful to you if you need a place to vent. Let her go though, she is the one that has to live with her (bad) decisions.