Netty- Trust me, any little random head pull or leaning on a bit is nothing compared to this. She pulls so hard that if you aren't paying attention, and don't drop the rein or bracy yourself strongly, she will pull you out of the saddle over her head. Which is why the owners ask for my help, after thier 21yo niece flew off over her head.
KittenVal- sorry that was a typo.... I taped her at 15.3 the day I started working with her. That's what I get for asking questions at 11pm. =)
I also agree, she shouldn't be ridden much. I am never on her longer than 45 min once a day. But again, she isn't my horse, I have told the owners that they need to let her grow up another year at least before any major riding, that just because she's big, she's still a baby. Ultimately, they are going to do what they want. I'm only trying to help them with a problem.
To answer your question she does this in every bit I have tried so far. Loose ring snaffle is what they owners want to ride her in, so I need to find a middle ground to get her uncomfortable in that action and be able to leave her in or work her back to the loose ring snaffle.
LetaGirl- If she were my horse, I may or may not use that tactic. But she is not my horse, the owners were uncomfortable with me riding in split leather reins because of the weight of the ends used for corrective spanking. There is NO way I could tell them "I "Fixed" her by wacking her in the neck..." even if that does temporarily fix the problem. The problem with that also is that when she goes back home, they would never do that to her, so she would go right back to square one.
One is closer to God's heart on a horse than anywhere else on earth!