Join Date: Sep 2011
Location: Germany- but not German =D
If it truly is 'mareish' behaviour, I'm sorry to say that for me it would either be pain, or rider error.
How does she lunge? If she's done this for a while, she'll probably do it on the lunge first too. I'd suggest lunging in gummi reins, so she has nothing to pull against except herself, after a couple of sessions, side reins. If its a learnt behaviour she will have to learn that a) she can't take the piss and throw her head up or b) fighting doesn't help. That way you aren't in the saddle. When she start messing round, send her forward forward forward. Let her run, let her run. If she wants to knacker herself out, let her, when she tries to break in to trot, send her forward again. She isn't going to relax straight in to an outline, but as soon as she releases that pressure in her neck, allow her to trot, or slow the canter down.
Please don't fix her head with side reins though, leave enough room to tighten them up, and don't ride in them. If she goes up she can't use her front to balance herself, and may tip.
Don't use a stronger bit, look at buying a thinner version of what you've got in her. If she's having problems and you change to this bit, three weeks time you'll have to change again. Find out why she's doing it. If she goes under saddle, get a jesus handle, and let her get it out of her system, knot your reins, and make sure they're secure, don't pull, and let her run as much as she likes providing she doens't try and buck you off, just hang on,she'll realise fighting is futile if she has nothing to fight against.