How do we know that Joan of Arc was French?

She was born in Domremy, France, and was instructed by Saints Catherine and Michael to deliver France from the hands of the English invaders. She sought out the son of the deceased king of France, whom she regared as the heir to the French throne, and she led him to Reims, where she stood at his side while he was crowned Charles VII of France. Why would she have done any of this if she was not French?

ALready responded,but I still post.
She was in Domremy, a French village in almost middleof France.
She was a village girl (teenager) and she managed to speak to high clerics both in Chinon and Rouanne. Thus, she should have known Latin, French or English. Beiing a village girl denies knowldege of Latin and she definetly was not an English.
She fought for France, for the Dauphine Charles VII, she died for France.