Way I do it gives her the option to refuse or try to cooperate. She listens to me asking her to easy and wait. Once it's on, she won't bolt off. She's similar to my gelding when I first started with him, but to the extreme of taking one step forward and two steps back.What is the reason for not working her alone in the round pen in halter and line?
If she jumps around and loses the saddle then takes off loose it reinforces to her that she can get rid of something she doesn't want anything to do with, as opposed to learning some coping skills and that she can trust you.