Oh my gosh, I am so very very sorry for both the mental and physical pain you are in. As much as you love her I know that all of this must be a great disappointment to you and the family. Still it is not her fault and with lots of love and training she will turn around. It's too bad that the people who sold her to you were not honest about her personality. With an animal as big as a horse (no pun) personality is so important. I am sure she will calm down in time. Every thing is new to her, the home the rules the training. She must feel a great deal of stress and confusion and that is why she is acting out. Patience and love with a firm hand. I know she will become the wonderful horse you have wanted soon. Good luck, be safe.