I wouldn't recommend any books right now. When my wife was acting like yours, the last thing she wanted was for me to fix her by asking her to read some material I felt would be helpful.
I would stick to DB and try to detach and have no expectations. If she isn't telling you how she feels I can guarantee you can't read her mind so there isn't much you can do.
Get a life for you, make yourself happy. If she is miserable its not your problem, she has to figure out her problems on her own. For me the hardest part was no intimacy and after I finally dropped the expectations I could think more clearly and do what made me happy without my wife.
I actually think she is testing you, making sure you are waiting for her. You need to act like you can live without her or nothing will change.
I just found your thread today, you asked about the 5k, don't help out. You end up getting used and while you might think it will help get her back she has no respect for you right now so tell her you can't do that.
Shaky
M 42 W 41 S 10 D 7 M 15 Years T 20 Years Divorce busted