Agree that you need to do whip desensitization training. Did this with my 3yo when it was time to start using a whip but he over reacted to it. I think his experience prior was a lunge whip being used to gallop him around the ring to get his admittedly prodigious energy out.
Take her in the round pen on a 10-15 ft lead. Put her in a whoa, then walk around her with a short crop. Don't hold it like a whip, just pretend it is a random something for her to play with. Let her see it, let her sniff it, heck, let her eat it. Then just rub her all over with it while talking softly and telling her she is a good girl. If she tries to move have her stand and start over again. Once you get to the point where she is comfortable with this, do the same thing with a dressage whip...again, not hitting or tapping, just getting her used to the touch/tickle. Basically, all you are doing here is getting her used to the touch and sight of the whip and teaching her that she doesn't need to fear/jump out of skin every time you pick it up.
Once you can do this, it is time to start teaching her that a tap means to move away from pressure. Using your hand or a spur, give her the signal to move her shoulders over one step. When she does, release the pressure and say good. Then repeat, only this time, tap with the whip at the same time. Also do this on her flanks to have her move a step to the right/left. Eventually, you should be able to tap her and she will move the part you are tapping. Again, do all this from the ground.
Once she is comfortably doing this on the ground, you can mount up and try it at the walk and then go from there. I've found that turns on the haunches and forehand and leg yeilds are perfect for teaching this lesson. When I first started this, I only carried the whip for the 10-15 minutes I was specifically training with it. Eventually you can hold it the whole time.
Unless she is seriously scared for some reason, it shouldn't take more than a week or so of 10 or so minutes a day doing this.
BTW, once I had my horse used to the crop and dressage whip, I used the dressage whip as my whip while lunging and then gradually transitioned to a full lunge whip. I still have to drop that occasionally if he is too hot lunging, but usually, I can consistently carry the lunge whip now.
Last edited by PoohLP; 03-23-2012 at 04:27 PM.