Reining in vain

Yesterday was the Alzheimer's fund-raising walk. I help coordinate the registration table, but managed to get home by noon. I headed right for the pasture where I collected and hauled all the burdock I could find since it's getting out of hand. After that, I was bushed. A cold has worn me out.

But I grabbed Sparkler anyway and saddled her up. We started with a John Lyons exercise. She flexes and responds well to the rein on her near side. On her far side, she resists and tightens up. She was so mellow I lunged her a bit and got on. She just had to rub noses with Red on the other side of the fence and I knew she'd hit the electric wire. When she did I braced myself, but she just jumped a bit, then backed off. I'm not making any progress with her response to the reins. I'm not sure what I should do...