I am not sure if the breeder is in Tennesee or not but here are the laws for Tennesee but you can change it to say look if the breeder is in Arkansas.
You don't state was exactly is wrong with your puppy but the ride home will not kill a dog.
Tennessee Consolidated Dog Laws
Did you get a contract? How did she keep her dogs? Do follow the humane treatment for the state?
You also might want to look into small claims court...
You have taken some great first steps..