I might try a grazing bit or the one bsms posted - I'll keep an eye out and see what deals come my way. I'm a bit concerned about TrailHorseRider's experience with the grazing bit though. Scarey - what if she did get it stuck in there? eek.
Tinyliny - I don't think the bit sits too low. I'll double check, but when I first got this bit I asked for guidance and we all came to this position. Of course, those pics were better. Its so difficult to take pictures of a dark bay, especially in the winter. There is no contrast. She never gives me a hard time with the bit: bridling, unbridling, riding, leading, grazing. Other than this shank play.
Oh and she didn't do this at the beginning with the bit; it really seems just like some fun thing she found. A roller bit might be a thought; I'd have to look for one without a port. Actually, now that I think about it, she also used to play with the lead rope, but not as much as the shank.
I supposed I could also move back to the french link; just she holds herself and responds better with this bit. Not a lot of difference, but it's enough for me to notice and I'm no pro.
Thanks for the input. Sounds like training her out of it won't be easy. Maybe I'll put something on the shanks until I have a chance to try another bit. Not really bad tasting, just icky. Like pine sap