What breed is she? How old is she? What is her previous experience with handling, training, etc?? That is extremely vital information. But, I will try to offer some insight for what I can see is going on with her.
She has been turned out for 2 years. This usually implies that she was not handled much, if at all. And even though she may not be sensitive, she is still not accustomed to the feel of human hands all over her. That can change once you start working with her and put her into a routine.
I would recommend a stall or living area for her for two reasons. She first needs a designated area in her own mind which she considers "safe" and "home". She can not only learn to be groomed and handled there, but will find comfort and security, and a familiar place to get back to. She will also learn the path back to her stall/home instead of getting lost. She will remember the way back. If she is roaming around the paddock with no landmark, she will get lost and continue to have feelings of insecurities. The other reason is so that you have place to keep her inside when you start handling her. I do not recommend working with her in just a wide open area. If you want to focus on communicating with her, you would be better of in a smaller area, even if it's a small round pen. She should be halter broken again and learn to tie safely as well.
This is one example of why I like working with horses when they are foals and not leaving them turned out for a couple of years and then bring them in for training later on. I am a firm believer in working with horses consistantly, while still allowing them "grow up time" or "kid time" without taking away their fun youngster days. You are now having to deal with a horse that needs to basically go back to square one all over again. Please be careful, but be consistant, confident, and thorough and you will do fine. Let me know how things progress...:)