Tend to agree most with Dustbunny. It sounds like no. 1 you need to section off a small area of the paddock, or build a yard asap. And no. 2, you need to find an experienced horseperson or 2 - pay a trainer if you need to - to teach you how to deal with this horse, to catch her & handle her if you don't have a clue how.
There is nothing at all mean about leaving a horse in a paddock to be a horse & not 'loving on it' regularly, basically speaking - she's probably been having a pretty pleasant life for the most part, altho company would be nice for her. She may not be terrified of being caught/handled(& just being left for months wouldn't make her so), but she may just have been in unpleasant situations when humans caught her before - such as being taken away from her nice cushy paddock, and she's smart enough to try to avoid that.
But healthwise, I expect she is likely obese, her hooves have been neglected, so she may well have foundered, be insulin resistant(like type 2 diabetes) and so will need some special care. She probably also hasn't been wormed or had teeth attended.
It is not hard to catch a pony(despite the unhelpful 'good luck' comment above), even in a big area, if she already comes to feed, and not hard to teach them that people can be nice to be around after all, but if you don't know what you're doing, esp as you do have some unpleasant tasks to achieve with her, it's also easy to just reinforce the lessons/attitudes she's already learned & make matters worse. That's why starting in a small area & finding knowledgeable helpers, to teach you/her on site is important, and something we can't really give you online.