Hello - Where did the purchase come from ? She might not need anything to return it
You can get your order number directly off of amazon.com
1 - goto www.amazon.com
2 - Sign with your username and password
3 - Near the top of the page to the middle/right side is a menu item that says "Hello ...Your account"
4 - Move your mouse over top of Your account.
5 - When the menu list appears go down to "Your Orders"
From there you will be able to see all the orders you have placed.