She was published by Little, Brown and Company, but that probably won't help you contact her, and she certainly wouldn't write back.
On Stephanie Meyer's personal website, her brother says:
For those of you hoping to find an email address or a way to contact Stephenie — I apologize. There is currently no way for fans to get in contact with her. Stephenie is still much too busy to re-open her fan email or snail mail addresses. Also, I cannot forward emails. She is in the process of writing/editing multiple books, and I think we can all agree that we would rather that she spends her time writing instead of reading thousands of emails every day.
Personally, I'd prefer she spend her time doing anything but writing, and think that you could get better writing tips from almost anyone else.
