As others have said, "Jewish" covers a very wide range. An ORTHODOX Jewish girl - such as one I have recently met, for example - will not even shake a man's hand. You would have to do a LOT of research before writing this book, and it will take you a long time.
Allison, just adding something having seen your Update. I don't think anyone here is in the slightest bit offended, hurt or insulted. I think we all feel you are not equipped to write about something about which you know so little, that's all!