To accomplish this and get letters to her on a regular basis, you need to go to www.dearelder.com. From there you select the "Pouch (Free)" option which takes you to a page that looks like this:
The Pouch Deadline tells you how much time you have to type your letter into the website. From there - the DearElder website will print your letter out, fold it the correct way, and send it off to Katie all for free. I tried it last night and it was great. Thank you DearElder. Good luck to everyone who wants to write Katie a letter.