This sounds like an interesting project.
I suggest you use a coursebook at her level that you're familiar with. I can suggest English File, Headway, Language in Use. However, these all practise British English. I'm not familiar with coursebooks that teach American English. The easiest will be to use a book you know well.
Your student will need a lot of practice in listening and speaking. For speaking you can use Communication Games (beginner) by Jill Hadfield; this book gives very controlled practice of the language, you will be able to move onto other activities when your student progresses and gets more confidence. She will also need to learn a lot of vocabulary; I suggest you use English Vocabulary in Use, published by Cambridge University Press.
After a few lessons and when she has a reasonable level of English, you can introduce her to elements of American culture and daily life. You will be able to find material for this on the internet.
I hope this will help you for the start of your course. Please feel free to write in again if you would like more information.