Of course, the money in the bank is already yours, G2B, rather than some kind of future-inheritance-existing-in-the-present as she has persuaded you to believe. However, now that she is dividing the will equally, that money is yours free and clear. It might be rather fun to point this out to her (very mildly of course) and remark on what you might spend it on. A new car, perhaps? Heh heh heh.
I think your resistance has been lowered by her few occasions of good behaviour recently. Whilst we were all pleased for you when they happened, I don't think we attached the same significance to them as you did. Hard as it is to accept, she will not change. You will always have this battle, and it will get worse as your children get older.
The positive side of this is that you now recognise her behaviour for what it is. You are mostly free of the FOG. This will help you to develop armour, over time.