I had a horse that did this many years ago. One of my teachers (a very awesome man, Johnnie Wetherington) told me to go out into the pasture and not to even look at her, just keep walking around, slowly, like I was looking for a quarter in the grass. He said she’d get curious and would want to see what I was looking at and sure enough, she did. When she got right next to me, looking to see what I was looking at, I would slip a lead line around her neck. Worked like a charm.