Maybe I'm just dense, but I'm fairly certain that she didn't want to have sex when she asked me if I was going to bed. I think she just wanted to go to bed and spend time with me there reading. I'm pretty sure sex with me is the last thing on her mind right now, but I'll continue to post here and maybe you guys can point out my lameness in recognizing signs.
She may or may no thave actually ALLOWED you to have sex with her.
She most CERTAINLY wanted to know she could still CONTROL you by using sex (or the promise of it) -- probably to then rudely reject you again.
As you do your successful GAL and detaching stuff (and yes, John, you have done some of it well), it throws off the marital relationship equilibrium that she's accustomed to, and she's trying to dangle the carrot of sex as a means to get you back under control.