I don't know why she stopped listening to you but I was helping someone out with a mare that would also refuse to budge.
First things first, look at yourself and make sure you aren't making any mistakes or giving conflicting signals (not saying that you are but its always my first option - too look at myself for the problem before the horse).
Then, with this mare, who was just stubborn and had learnt that if she just stood there, her rider would eventually give up. So I decided to go in a step wise fashion with her. I was lunging with a long rope (not a lunge line) but no whip (just what I happened to be using at the time).
So the step wise fashion of asking the mare to move forward was:
1. Slightly lift the arm holding the lunge rope (if I was asking her to go to the right this would be my right arm) and gesture with it (hold it slightly away from the body, towards the right) to show her which direction I want her to go.
2. Ask her to walk on.
3. Got no response, so upped the pressure by swinging the excess rope I had in my left hand. Repeated walk on command.
4. Still no response, moved the swinging rope closer to her. Repeated walk on command.
5. Still no response, let the swinging rope hit her shoulder (not beating her with it) and again repeated the walk on command. With this particular mare, I'd been warned she kicked out so that was one reason I went for the shoulder not the hindquarters, and also, the girl had done lots of Parelli with her and any pressure on her hindquarters and she just yielded them away from me and ending up facing me head on.
6. Mare moved forward, immediately took of the pressure and stopped swinging the rope. Initially she only moved a step or two before stopping but just repeated the process. I went up to step 5 twice and from then, the mare either responded to the walk on command, or occasionally, if she returned to being stubborn, to the swinging rope.
The girl I was helping got very upset with me because I 'hit' her horse. I had to explain that I wasn't abusing her horse, but that you had to escalate the pressure in a step wise fashion (very important to give the horse the opportunity to respond to lighter pressure) until they respond.
Its pointless doing what the girl was doing, which was just swinging the rope more and more but never escalating until it touched the horse because the mare just learnt to out-wait the girl. You have to keep it up until they respond and they quickly learn to respond to lighter pressure. Its an important differentiation from abusing/beating the horse.
I'm not sure if this will help at all since I don't know how you are lunging and what equipment but the basic principles are the same. Ask, tell, demand. Just keep upping the pressure until she responds and she'll quickly return to the obedient mare you had before.
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