I have a horse that sounds like you, and I do a lot of things WAY different then 'modern dressage' and the horse is coming along wonderfully. He's hot, and extremely sensitive, and used to have a huge, muscled underside of his neck, lol!
The first picture of her looks really bad, with her crammed into a frame and no muscle to support anything. The second looks better, and although she is resisting in the third, she really isn't on the forehand.
Here's what I do with my horse:
With the inside rein, I ask him to relax his jaw. when he does, I give him a loose rein--that way, he can't pull and lean on it (he used to lean REALLY badly). I don't keep contact with him (at least not a tight one) for several reasons: one, he has a sensitive mouth, and two, he leans when there's contact! When he relaxes the jaw and poll, guess what? His head falls on the vertical the way it should, and theres nothing for him to resist, because there's no pulling.
Remember, it takes TWO to pull!