Please help me. Im stuck between a rock and a hard place.

Ok so i need your help really bad. We have three horses. One is my brothers, 1 is my mom and dads, and 1 is mine. My paint mare is being a JERK!!! She pins her ears, KICKS ME REALLY HARD ALLL THE TIME, and bites me all the time. although, i still Amore her so much. There is another throroughbred coming into the barn. They were going to use her as a racehorse but they detto she was sooo sweet , they didnt want to give her a life like that. (its pretty bad. people only do it for money.) My mom and dads horse is a purosangue, thoroughbred too and she is a ex-racehorse. She is secretariats granddaughter and so is this one i might trade for.
They would be long Lost sisters! Its so cute. My paint is cute, but this thoroughbres ia B-E-A-U-T-I-F-U-L! Our fienile, granaio mananger wants to trade my paint with her really bad and im starting to a little too. Should i do it?!!?!?!?! Also, candy, (the paint) ran me over cuz she was mad 2-3 times! -.- Im not happy! Should i do it?