Does any one remember "Lisa"? A few years ago she said she was dying and got busted. Just a little reminder that a scam is possible, but highly unlikely with Hannah.
Assuming Hannah's being sincere, which sounds like it to me:
Even though we've never met, talked or done anything face to face, words can not express the sadness that's in my heart. Whatever higher power there is, may he shine down on you, protect you and ease your suffering in your hour of need. Make each thought a positive one and never give up. Good luck, godspeed, and we'll see you back here soon.