I think she needs motivation- whether it be getting to rest when she's near you, or getting a treat. These are the two options I generally use for hard-to-catch horses:
1- If she wants to move, she gets to move. On five acres, you're going to have to do some leg work, but just keep at it and give her as little rest as possible. You can chase her around until she comes to you- when she is rude and canters away, she gets to keep moving. If she comes up to you, she gets to rest, and I would suggest that when you take her out you just groom her or give her a bath, something that's not work so she doesn't associate you catching her with something unpleasant. Treats when she comes up to you won't hurt either ;)
2- This is generally how I approach a horse that is more scared/ timid, and not just being a brat. Basically, just walk into the pen with treats, and when they run away, stand there and ignore them. If this doesn't peak their curiosity, shake the treats or something to get their attention- as long as they're interested in you. Let them slowly walk up to you, and don't move until they've sniffed you/ etc. Slip them a treat, give them a pat, and if you have to, don't even bring the halter in- as long as they come up to you and are comfortable, you may just want to leave it at that for a day. Keep doing this and taking baby-steps until you get to the point where you can rub on them around their head and neck, like putting on a halter or a lead around their neck, and they are completely relaxed.
Hope these help- I'm sure there are some other cases out there, but this seems to work with all the horses I've encountered.