I would treat her as a completely un-broke filly fresh from the pasture.
Start by free lunging, not to much, just enough to get her blowing and then approach with a special treat (if she's dry lotted, grass, otherwise a fruit, cookie, candy, etc.).
Make her come to you, don't chase after her. The moment you give chase it becomes a game and her respect is diminished.
I would do this for two-three days. Free lunge, then offer a treat, make HER come, halter, and work as usual.
After getting her hooked on the work-n'-treat, approach (don't offer a treat or free lunge) the moment she starts going, keep her going. Free lunge a minimum of five minuets, then approach again, if she keeps going, keep her going. The moment she stands for haltering, give her a special treat.
The whole idea behind the process is to make running away uncomfortable, and standing for haltering comfortable. At the end of the training, you should be able to approach from anywhere and halter her without a problem.
I've halter broke a colt and a mule within 30 days (I train in between work and school) using this method and can approach my colt anywhere...in the pasture, paddock, or field, and halter him. I'm currently working a third colt with positive results also using this method.
These, of course, are unsocialized, wild colts that freak out when you give them a pat on the neck. With a older, more touchable, and somewhat catchable horse I suspect that the training will be much quicker.
Wait! I'll fix it....