Your focus needs to be on LISTENING, not TELLING.
The central mission is to encourage and help the woman tell HER story, not the story you are imagining she has to tell, and not the story she thinks anyone else wants to hear.
Focus on HER experience and memories, NOT on a list of questions.
The best preparation is listening carefully to what she wants to tell you, and gently encouraging her to answer open-ended questions. Pretend you are not a lawyer. Pretend you are not in a cold detention center, shivering, stressed out, and in a hurry. Pretend that this is the most important person you have ever met, and you are dying to know what she has to tell you. Know deeply that you have NO IDEA what her experience is and what has to share with her.