You say you've had her a couple of years, has she just been out in pasture with no human contact all this time? Is she the only horse now or is she out with other horses? What have you tried with her? If you have a smaller paddock or can fence off a smaller area to keep her in by herself and then just spend lots of time in with her, you don't have to try to touch her right away just talk to her while you water or clean or just sit on the ground talking to her. Get up and down, walk around the area and she will get used to you being there. When she's no longer upset with you being in her space the try some goodies, apples,carrots store bought treats whatever she'll take a liking to and try babysteps in a touch when she's taking treats with trust. It can't be rushed, you need to spend some serious time with her. Lots of time and patience. Take a whip in with you if you need to and let her know you wont tolerate any kicking or charging but otherwise just be there until she accepts your company. She is a pretty mare and at least needs to have ground manners to be used for anything more than a lawnmower. Good luck and remember lots of time,like daily and patience.