I don't know your W but I do know just a little bit about people.
IMHO, I really don't think your W is indifferent. I see that she is trying very hard to build walls between you. To try to block you out, to not show any emotion, to not bond with you in any way. How do I know she is TRYING to do this and has not in actuality achieved it? I know because you don't get over a marriage in three months. You don't just FORGET your partner, your spouse as if you are changing clothes, unless she is an EXTREMELY shallow person. And from what I have read from you about her, I don't think she is shallow. A little detached perhaps, but not shallow. In fact, she loves all types of relationships with people and have a close relationship with her family so I doubt she is shallow.
So I am assuming what you are seeing is an act. An act to detach, to move away from the conflicting feelings she still has for you. Yes, they are conflicting because when the anger dies down, she still cares for you but she feels she can't live with you.
She needs to take this time to sort her feelings out, to sort her thoughts out to find what she REALLY wants. Time away and space to do some thinking is a good thing for her. She needs it. And you are an exceptional husband for giving those things to her which are the most difficult to give. FREEDOM.
If you love her, set her free. I think about this quote everyday.
She is definitely seeing the changes in you. Don't worry about it. Just keep being friendly, not pursuing. Eventually she will give you another thought. It is a very good thing that she is not rushing to D, it means she is still thinking things over.
Me:39 H:40 S:9 D:7 First Bomb ONS:June 07 Second Bomb OW: March 08 Separated: March 08 M:15 yrs T:18 yrs H deep into A with OW Achieved ACCEPTANCE May 30, 09