Thanks everyone for your advise!
When I bought her I did try her out at her own enviornment. She seemed fine there, although I could she her marish tendencies roaming her land. My husband wanted a mare!!! ;)
I do free lunge her before riding.
I have worked with two different trainer with two totally different approaches. One is more horsemanship oriented and says that she just needs to build a relationhip with me and the rest will fall into place, ie. She will be more willing to work for me, if she gets to trust me. Which makes sense and although she seems to respond well to it, she is very hard to maintain that calm, cool and collected attitude all through the ride. The second trainer, is all about a give and take. She needs to give and I will give. She doenst give I wont either. This also works, but by the end of the lesson we are both physically and mentally exhaused. I just want us to be happy together! I am off to one more trainer on Tuesday! I don't want to stress her out even more by switching trainers, I just can't seem to find the right fit.
Bottom line I am sure it is will take time! I just don't want to get any worse. And get myself in trouble with a troubled horse.