So interesting to see others following almost the exact same path as me. About two months ago I started a nearly no contact policy with my W. Just like you, I treat her like a ghost. The only time I see her is during child transition, which I conduct very quickly, I don't look at her, only respond when directly asked a question, and then with one or two words only. She tried in various ways to draw me out, but seems to have given up for now. Has done wonders for my emotional health.
The question is, why is your W delaying the D? Is there any way you can find out? Should you just come out and ask her? Has she shown any signs of trying to reconnect with you?