You give her what she wants... at least emotionally. She wants to be away from you, give that her. She wants to be divorced, give that to her. She wants to be single, give that to her.
It does get better, oddly enough, with each step away... at least that's my experience. The coldness thaws and you can at least get to a better place perhaps. You're right of course... you can't stop her from bringing up the D. And you can't stick your fingers in your ears and go "la,la,la,la I can't hear you", so then you have to discuss.
Bkyln's advice on the L and the process is spot on. You give her what she wants, but that's from the emotional side. The actual D is a business transaction, not a relationship process.
Married 6 together 8 Me:38 W:31 second marriage for both SS12, SD10, S6 Bomb: 9/8/11 (day before our 5 yr ann) W moved out: 2/18/12 D final: 11/12/12 Share S 50/50. Spend as much time as I can with SS & SD