She is a beautiful horse. Personally, I would try to get some of her behavior problems into check before she gets too fat and sassy. Why is she so nervous? I'm brainstorming here. Did the people that had her let her get away with stuff and now she wants to do what she wants to. Is she buddy or barn sour. Does she have a properly fitting saddle so that she is comfortable. Or any combination of the above.
From the picture she appears to have high withers. If the people that had her had a improperly fitting saddle that put pressure on her withers or bruised her withers she could be hurting or very uncomfortable. Maybe she's trying to tell you that. I don't know, but something I would look into. Also were they mounting her correctly or were they pulling downwards on the saddle to pull themselves up too much so that it was pulling those back muscles.
This is where I would start. I bet with your time and patience that she is going to learn to trust and respect you and turn out to be a wonderful mount.
All the other comments I saw are valid but this is a thought I was not seeing that might help.
Best of luck.
From the picture she appears to have high withers. If the people that had her had a improperly fitting saddle that put pressure on her withers or bruised her withers she could be hurting or very uncomfortable. Maybe she's trying to tell you that. I don't know, but something I would look into. Also were they mounting her correctly or were they pulling downwards on the saddle to pull themselves up too much so that it was pulling those back muscles.
This is where I would start. I bet with your time and patience that she is going to learn to trust and respect you and turn out to be a wonderful mount.
All the other comments I saw are valid but this is a thought I was not seeing that might help.
Best of luck.