Ok, I read through this thread. May have missed some things. Here is my suggestion: have you driven her before? Can you? Tacked up and same bridle. If not, try it and get her to move forward. You need to figure out the trigger. Stubborn? Young? There is some miscommunication here and you need to figure it out. Do you lunge before you ride? You say she seems full of energy and fresh.
I wouldn't hit her on the head. That's my personal feeling. Someone I knew used to do that and I don't think it worked other than to give the horse a sense of pain from the thing on its back.
If you can afford a trainer then go for it. Because you've only had her for a short time you both don't know each other that well and she is probably testing you. This must have worked for her in the past. Now to change that she needs a strong person. I hope you can get past this safely and continue a bonding and fun relationship with her.
Posted via Mobile Device
Yes she is young only 5 she hasnt been driven and I always lunge her and put her on the walker before I ride her I am beginning to think that it is her teeth so I will have the dentist too come down and have a look because she is perfect in every other way and I paid a lot for her so I need her to begin behaving!
She does it a lot when I am asking her too bend I am conviced its her teeth so I will be looking forward too her from the dentist :)