I have a nine-year-old Mare that offers great difficulty obtaining a left lead. When in the left lead she doesn’t seem comfortable and holds her head high. In the right lead she’s more relaxed. She has had recent acupuncture and chiropractic care and no issues were found. Her way of escape when scared is always to the right. When nervous and anticipating a lope she will cock her head to the right. Any suggestions on getting her into the left lead and relaxing there?