So I get this 5yo green broke paint mare a few weeks ago. Dealer said she was green broke and bought from a local. I have been doing ground work like lunging, showmanship and long reining with her when the weather is fit in SE Ohio. I figured seeing as how she didn't know much I should start from the beginning and build a solid foundation first. We progressed to the riding stage after two and a half weeks of basic training on the ground. So the first couple of rides were fine. Just wanting to see what she did know about being ridden. I ride western and in a D ring pinchless snaffle. She is a smooth ride and seems willing enough until today. We started out fine until she got tired of turn on the haunches and forehand and stop and back all in random patterns. Today she was "I am over you riding me and making me work for a living and so I am going to half rear and you will get off and leave me alone!" I urged her forward with my legs and she starts shaking her head and bobbing up and down like a boye in the ocean. I spin her in circles left and right and make her work through this nonsense. She calms down and rides foreward until I ask again for a simple turn on the haunches which we had been doing for the last half hour or so fine before all this rearing crap started. Then she gets mad and starts the rearing crap again. I worked almost an hour to overcome this and finally found the opportunity to end the ride on a positive note with not much enthusiasum from my mare. I checked her tack and nothing was pinching or binding. I think that maybe a past rider just got off and gave up and left her alone when she acted like this and now I am left with a spoiled 900 pound brat! Any advice would be appreciated!