Question: If the French kidnapped the Native American woman, then why were the natives trading the furs with them and saying that they needed horses to find the woman. Were the French hiding her?
Answer: The French were lying to the natives. They had kidnapped the woman and then sold them provisions to help the search for her. They benefited further from the Native Americans killing their rivals.
Question: Where did Fitzgerald and his partner obtain the two horses which they rode into the fort?
Chosen answer: They stumble over a burnt Indian camp and found the two horses there.
Chosen answer: She had plenty of time to tell him whilst watching the fight.