Not sure if your suggestion would work at this stage. This dying (assuming it's not a scam) person is already real and embedded in their hearts, especially if they read her older posts. They would have to pick cute kittens or sad pictures over a cancer girl, not an obvious decision. Like Murder-Gandhi, they have been irreversibly changed and would require a sobering pill to snap out of it, which they would probably refuse to take.
Saw this on reddit.
http://www.reddit.com/r/atheism/comments/ydsy5/reddit_help_me_find_some_peace_in_dying_young_im/
I couldn't help be moved by this. I felt a very strong sense that she is one of us, whoever "us" is. Looking at some of the negative comments and worst of all bad arguments people are using as reasons not to donate made me more upset.
I hope some here might join me in dismantling them. I'd also encourage those like me for who this buys a lot of warm fuzzies to donate. Though it might be wise to wait until we hear from CI or some other third party on the matter.
Edit: She has since made a comment on LW! The provided information has made me pretty much certain that this is a genuine plight.
redditors where willing to give her money to go skydiving, they don't want to give her money to buy cryonics. Sometimes I can only weep.
I think it pretty clear that promoting efficient charity in that particular thread is very unlikely to result in people giving money to better causes. Also I just plain want her to be rewarded in some small way! Note the part starting in the second paragraph that I bolded, not only did she realized what she really was, but she stepped over the entire set of pro-death rationalizations and faced the social pressure people she loved exerted on her because they think she might go to heaven ... its not her fault that a few cells in her brain went haywire before she could afford an insurance policy, I just don't want people like that not having something to show after getting so much stuff right.
2n Edit:
For anyone who just realized the universe sucks and wishes to do something about that whole people dying thing, they are welcome to engage in some optimal death defeating philanthropy by donating to The Brain Preservation Prize that has been endorsed by both Robin Hanson and Eliezer Yudkowsky.