Yep, quit trying to bribe her. You actually can't bride a horse to do something they don't want to. You can, on the other hand, reward them with a treat/grain/etc. when they have done the desireable behavior. There is a fine line of difference, yet it is a huge difference once you learn it and use it.
How large is the pasture? SlideStop's method will definitely work! But, the larger the pasture, the more difficult , read that as the longer it will take ,,but it will work.
Is it your own place, or do you board her? Are you the one who feeds her or someone else? Or just grass/hay ... ?
I was slowly being successful with the 'catching game' ,but my success JUMPED to great when I had to move him to a different boarding barn, and I was the one to feed him on the days that I go to the barn. He KNOWS that when I arrive, I will be giving him his feed. He now comes nickering to the gate to greet me.
But, even if you are never the one to feed him, you can still win the catching game. Remember that with horses that drive creates draw. Google that phrase and see what all you can find , bet there'll be lots of good info.
Do you know how to yield her hindquarters to cause her to face you with both ears and both eyes? That's how you do the 'stop' portion of what Slidestop described when he/she said 'ask her to stop'.
So, if she doesnt come to you, gently but firmly drive her away. No need to be mean or aggressive about it. Use your lead rope, or stick/string (natural horsemanship tool), or even a lunge whip---swing it , flap it, make some commotion and get a 'move those feet!' look and attitude about yourself. Even if she gallops away, it's ok, just walk with a purpose toward her. As you get near, start trying to yield the hindquarters (learn how to do this). If she won't give you 2 eyes and 2 ears, then drive her away again. If she does face you, then relax your posture/attitude and casually see if you can walk to her. The first time (or two, or several) that you can approach and touch her, just rub her , give her scratches, maybe wad up the rope and rub her with it, then turn and walk away. This will blow her mind that you didnt CATCH her. Make a point of sometimes NOT catching her even after she becomes easily catchable. That way, she doesnt associate you're coming into the pasture as always being caught.
Don't try to hide the halter or rope, no sneaking up --that feels very predatory to her. Just have it casually on one arm.
Ditto what SlideStop says about just sitting with her. This is called undemanding time and is very powerful stuff. Go into her pasture. If safe (depends on # of horses, etc), take a chair and just have a seat. Stand and study a blade or two of grass. If/when she approaches, dont' try to call her , let her do it on her terms. Don't touch her first. IF she touches you, then you can rub her. Don't demand anything of her, just keep her company. Then leave.
Good luck! Keep us posted on your progress.