Wonderful that the original owner is willing to come help you!
As Lightning suggested, a good starting place would be a vet check. Most equine vets make farm calls so that will save you the loading issue for now. Besides, it's good to establish a relationship with a vet early. If you are going to have a horse, you are going to require the services of a vet and at the point of emergency is no time to start looking! And a chiropractor would probably make calls also.
I'm glad you are willing to take lessons. If you find an instructor/trainer for yourself he/she will probably have some good advice as to helping the horse or be able to point you in the right direction to someone who can help. The perfect deal would be someone who could do both, help you and the horse.
Taking on a horse with issues can be a challenge for an experienced horseman. So you do have your work cut out for you. For most of us here the combination of a green horse (let alone one with issues) and a green owner makes our hair stand on end, so please understand that some comments might seem abrupt. Mostly we want to help. We all started someplace. Read all you can, get DVDs, watch videos, ask experienced horse people, be patient with your horse and yourself and be consistent with what and how you ask, but remember one thing...She is not a pet. She is a large strong animal that can do serious damage often out of fear and frustration. Horses respect leadership. You can love on 'em, but they must always be below you in the pecking order.
Good luck with her, and keep us posted!
If you ever find yourself in a fair fight, it's because your tactics suck. ~ Marine 1SGT J. Reifinger