Woodley writes on Tumblr that she is donating her hair to a charity that will make it into a wig:
john green (author of T.F.I.O.S.), wyck godfrey (producer of the ﬁlm), and i all decided that this could be a beautiful opportunity to rally the troops of mankind and ask for some warriors to help contribute to the cause. any of you have 8 inches of hair to spare? or maybe know a friend or family member that does? if so, consider JOINING THE #hairforhazel TEAM! … you can donate your locks to http://www.childrenwithhairloss.us and use hashtags (is that the correct use of that word?!) #hairforhazel and #itgrowsback to help spread the word!