The letter I mailed to Chelsea this weekend said "you have not been forgotten". That's it. One sheet of paper and a sharpie. Nothing that could give whoever censors her mail an excuse to throw my letter out.
Her birthday is December 17th. I added a reminder to my calendar to send one each December 1st, to allow for processing time through the prison mail. One stamp and one letter can make a difference in someone's life, and Amnesty International has recommended mailing prisoners on their birthday.
http://blog.amnestyusa.org/asia/on-your-birthday-you-are-not...
Something that has nothing to do with her and her current situation, something that allows her to escape her situation at least in her mind for a little bit, would probably be welcome. If I were in that situation, I believe I would appreciate that anyway.
https://www.chelseamanning.org/learn-more/write-to-chelsea-m...