Welcome to the board Darkknight,
I am so sorry for your loss it's a deep wound to lose a child or children like this. I understand your position that you don't want to preach about falsehoods any more. Stepping down as an elder is your first move.
As a woman if I was in her position, I would appreciate extra attention. So you could take her for nice meals out and day trips on a meeting day. Tell her she needs to heal and missing the odd meeting will benefit her if you both are doing something productive. Get her to talk about how she feels about waiting so long to have children and if she has any regrets. You can use this to undermine the GB.
These would be steps I would respond to as a woman.
Kate xx