Join Date: Oct 2009
Location: Just south of sanity
When it comes to buying horses, it's caveat emptor unless you have a written contract stating you can return the horse for a full refund within a specified time period.
I'm going to assume you just paid the person cash and picked up the horse without any kind of written contract.
Horses are sold 'as is'. If you don't perform due diligence to make sure the animal is right for you, that's on your head.
I'm sorry you got rooked, but you're SOL as far as getting this person to take back the horse and refund your money.
Either send the horse to a professional to work out her training issues, or give/sell her away with full disclosure. Other than that, you really have no options, unless you want a permanent pasture ornament.