In my opinion, she sounds like a HIGHLY sensitive horse in which case hitting or force will not work and will actually bring her more in an uproar. Have you ever been riding a sensitive horse and kicked them a little to hard and instead of them going they stop and throw their head up or step backwards? It is too much pressure on them. I think you should try to get a different trainer or tell the one you've got to TONE it down a little and see how that works. If she is not willing to work with you, she is NOT a the trainer for you. Now this is just MY opinion but I think you should sit down and look up some reputable places to have a good solid 30 days of foundation training put on her by a professional, and reputable facility where you can CALL and talk to customers as well as make surprise visits on training sessions with chance. I think she is a little too green for someone non-professional to handle. She needs gentle but clear handling, patience and consistency. I think whips put too much pressure on her causing her to react in the way she does. When she is getting scared, get her away from you. The last thing you want is to be standing next to a scared frustrated 1000lb animal with nothing but self preservation in mind.
I think your best options would be and in this order:
1. Sit down with your trainer. Tell her you think she should take it easy on her, put the whips away for a change. Chance should not be getting that out of control without being provoked by something and I feel it may be the whips.
2. Change your current trainer to someone else if she is not willing to try something new. If trainers do not try something new, they are generally not good trainers. They should be able to change and flex their ideas to conform to different personalities of the horses.
3. Have her sent to a professional, reputable (KIND!) trainer with GOOD SOLID resources for at least 30 days of SOLID ground training.
4. I think your last option should be to sell her and find a more suitable horse. Probably one that is already broke to ride with a good SOLID foundation and is bellow a five on the temperament scale. I would be way more than willing to help you find a good calm horse, I'm just not the best at picking out a good conformation.