Hey, Romeo...are you hearing the voice of wisdom from the group, yet? All of these people (who have been through it) are telling you the same thing.
You have every right to ream this woman out over what she has done and continues to do - it is terrible. But what would it get you? Is she going to snap to her senses, realize what a b!tch she has been and apologize? Will it even go towards making the situation go more smoothly and fairly?
You don't need to sink to her level.
Rise above....someone here stresses Strength and Honor - good advice, there.
And please, back WAY off of G4...even your email to her which went into ways you spend your free time read "Hey, are these your interests, too? Want to come along?" If you don't take the time out to heal yourself, find your inner-Romeo and get comfortable on your own, you'll only be bringing all the old crap into any new R you may have. There is time.