Everything has been going really well, I've taught her a few natural horsemanship exercises and we've been long reining her to get her bending and working again and she's responded very well to all of this. Recently, however, she's started being difficult and refusing to do certain things. The biggest issue is that she sometimes decides she doesn't want to leave the other mares and come out of the field. I've tried calmly waiting for her, gently asking her to move and also getting a bit annoyed and flicking her bum with the lead rope, but none of it works. If she gets worked up she gets grumpy and has almost kicked me in the past so I'm quite wary of her moods! I don't want to start coaxing her out with food, especially because there are 3 or 4 other mares in the field and that's just asking for trouble! I tried to get her out of the field for over 45 mins today and eventually had to give up.
Her owner says this is something totally new, she's never done this before. I would expect she would be keen to come in from the field as that's when she gets a feed too.
Does anyone have any tips as to how I can persuade her to do what I want? I feel so frustrated and like she is winning the battle when I give up and leave her in the field.
P.s. She is also doing this with her owner, so it's not just her testing me!