Ok, first, make sure you have a day without much to do.
Don't worry about chasing her, just annoy her. Carry a halter and bottle of water so you don't pass out and just walk after her. If she pins her ears or shows signs of aggression, give her a little extra push, but nothing crazy. Just keep following her until she stops, faces you, and gives you her attention. When she faces you, you stop. Just stand there. If she walks away or even breaks eye contact, walk up to her again. If she walks away, follow along. If she can keep her attention on you, then just stand there. Don't rush anything and don't try to sneak it on her. When she starts relaxing (dropping head below the withers, licking and chewing, yawning), approach her politely and invite her to acknowledge you (touch her nose to your hand). If you can pet her square between the eyes, move in and give her a scratch. When she seems comfortable with you there, then walk away, don't look back, and leave her alone.
You may not get to the point of touching her, if you can just get to the point where she is facing you and relaxed, then I would be satisfied and walk away and repeat the next day. I must warn you, I have known this to last up to 5 hours with horses that have learned all the tricks in the book. However, I have known horses that are tricked into catching for years and it just gets harder every time. This solution solves catching problems. I've used it on aggressive horses, feral horses, and horses that have just learned to stay away from people. It can take a while to make it solid, but once "catching" is solid everything else comes a lot easier. When I say catching, I don't mean putting on a halter, I mean having a horse approach you to be haltered. This isn't out of fear of being chased, but out of respect for your leadership and actually wanting to work with you.
Some will say that leaving without catching the horse will cause more problems, to which I disagree. Leaving the horse with the horse running like mad away from you will cause problems, but leaving a calm, relaxed, attentive horse will only lead you in a good direction, whether the halter is on them or not.