She doesn't have one.
This explains everything:
link The link is from Stephenie's official website and says (and I quote)
"For those of 你 hoping to find an 电子邮箱 address 或者 a way to contact Stephenie — I apologize. There is currently no way for 粉丝 to get in contact with her. Stephenie is still much too busy to re-open her 粉丝 电子邮箱 或者 蜗牛 mail addresses. Also, I cannot 前锋, 期待 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 写作 instead of 阅读 thousands of emails every day."
