Don't pick up the paper. Let her get it herself. Drop the rope COMPLETELY. Just say you weren't near a paper place or you forgot. No more giving her "just enough". YOu've chosen to pull back so do it all the way. So many here to help you with this. No more "happy happy fake separated family". Time for her to see the result of her decision.
I know you a bit. I know that when you drop this rope you will want to pick another up. Don't. You will want to make more phone calls and spend more time and message/email more to B or someone else. Don't.
