Is she still out on pasture? I only let mine out a couple hours a day. The rest of the day they are in a larger secure "corral" area and at night separated into their stalls. Not only for feeding time, but it helps to keep me as herd leader, if that makes any sense. Maybe separate her from your other(s) and work on desensitizing all over again? I know its a lot of work, but important. And hobble breaking is a must!
My mare got caught up in a hay net one time. She didn't get hurt, but it was shortly after she came to me and it really freaked her out I guess. Even though there were no physical signs of injury, she was uber sensitive around her front legs for awhile. We just worked on it daily until she got over it.