If you only ever go out to her pasture to bring her in for work that could be why. This happened some of my horses. So I used to go out to the field and just spend time with them so they didn’t think I was only coming to ride them. Also ignoring them in the field can help rouse their interest!
I would recommend trying join up first but if you get desperate try walking around her not to her. Take a lead rope with you then from a non kickable distance swing the leadrope and herd her up to a smaller pen. (I don't know if your paddoks are connected to your field)
Make the pasture smaller. Then when she does not pay any attention to you..chase her... If she gives you ear, eye or what ever... relax.... your timing has to be perfect but she wil learn that being with you means comfort and relaxing. Ingnoring you means work. Dont bring her inside right away when she comes to you. Reward her by Grooming and or play. Good luck!