I like what AnotherStander suggests. If you want to write her a letter, go ahead and do it. Just make sure it comes from a place where you are at peace with her leaving. However you word it, I would let her know that you love her and you want her to be happy. You would prefer that she stayed, but you are willing to let her go. Whatever you write, you need to make it your last communication. She should be the one to initiate talk about you two as a couple. You need to be prepared to move on.
Don't walk on eggshells around her anymore. It tells her she has you on puppet strings. Don't actively try to offend or upset her. You just start being Grizz again. Live your life. Be yourself. Surround yourself with good, safe people who love you and are your friends.
It's your call on whether or not to help her move. I'm not sure I could do it. Dobson says open the door. He doesn't say help them leave. Btw, I think it's good that she be the one who leaves. Her leaving makes it obvious to everyone that this is HER choice and not yours.
I just read a book in PDF format. The title is Surviving Your Wife's Midlife Crisis. Its written by Christine Schaap. You might want to check it out. She writes from her own experiences of being a WAW. I have found her writing and her resources found on Path Partners to be very helpful. U might want to check her stuff out.