Will they break her spirit?

It will be important to research the trainers and styles in your area. I have trained horses and have always offered references of previous clients. Go to the barn and take a tour. All trainers are different you just need to interview them and see who you think your horse would do the best with. Don't be afraid to ask questions. The old school style of training was to break a horse (of it's spirit). That is where that term came from. The current trend is gentling methods. The horses' natural behavior is used to get them to accept new things. There are many styles but all have a positive message.