I was just speaking with a trainer who is local and a family friend of mine. She says she seems to have multiple things going on, some holes in training. And that a good bet would be to take her back to ground work, fix any and all holes there. But make her wear her bridle a lot. With no reins, and not when eating. And she will figure out that putting her tongue over it is very uncomfortable and there isnt a reward for it. Along with continuing to lunge her, and ground drive her often. She said this would be a good start. Im willing to put the time in. And because numerous bits have been tried on her and she does this, I would rather not switch bits to cover the problem, but to actually try to solve the problem.