OK, I'll add another egg to the pot... I would start by putting her in a small paddock / big yard. This is not to corner her & force her, but to allow her free movement without being too time consuming & tiring for you! Repetition is a huge key to training, so unfortunately, it won't be anything like solid after only a session or 2. I presonally like to keep an 'uncatchable' in a small paddock for a week or so & do a few sessions a day, before letting them out into a bigger area.
I do not bother even trying to get a halter on a horse like this, until I've first gained their confidence, with me & my 'toys'. It's not really about the halter, it's what she expects you to do with it. Bodylanguage is a big part of it with horses. Most people are very goal oriented in their behaviour and this comes out in their bodylanguage. It's very good at turning horses off!
You see people all the time with nice soft expressions, until they want to catch their horse, when they become focussed & assertive. The horse is repelled and finds leaving relieves the pressure. Most of the time when wanting to encourage a horse, you need to use 'soft' bodylanguage, not direct, focussed. Use your bodylanguage consciously & appropriately to make the Right things easy & the Wrong things harder.
Now, the horse loose in the paddock, halter & lead in hand, I call the horse & signal it to come. If it comes, or even looks my way, I will visibly relax & maybe look down, away, even turn & walk away, depending on the horse & whether it's frightened or anything. I will repeat this over, until the horse comes to me. I will hold the lead out to it, but the instant it looks, or hopefully reaches out to sniff it, I lower it & offer a treat or such. Then I will turn & walk away, repeat the process.
Only once the horse is reliably & confidently approaching me & sniffing the halter will I attempt to touch them on the shoulder with it. Once they're confident about that, I will put the lead over their neck. When I first do this, I'll give a treat as I remove the rope & walk away. When they're confident & keen about this, only then will I ask them to put their nose in it... before treats or doing something nice for them & taking it off again.
So that's all there is to it.... pretty much....<TIC>. But often things aren't quite that easy. When you call the horse and it ignores you, or worse, turns her rump & walks away.... THAT is the time you use that focussed bodylanguage & get after the horse. Don't run, just walk steadily. I like to focus on the horse's rump, because that's the bit I want moved away from me. I also like to swing the rope at their rump for added emphasis and also to teach them to yield to & not fear it.
As long as she's moving away, keep the pressure up. The *instant* she stops, turns, looks at you... even if she only hesitates or puts one ear on you to start with, drop that bodylanguage & look/walk away. Repeat this process until she realises that all she has to do is face you / come to you, to get you to stop pushing her.