What you probably need at this point is for all the members who come into this thread to share the link to the photo with all of their friends—hopefully enough will come online before the contest ends to give you a healthier lead. What we should really be counting on is someone who has access to a sizeable active friend circle (high school or university members?) sharing the link and hopefully getting ten or so votes to you. Even friends active on chat (if you use it) would be an asset in the final hours.
As for the mystery of the votes, it seems that this girl is probably promoting like crazy to all her friends and family and telling them to do the same; if you read some of the comments under her photo there are a couple people who don't seem to know what the whole thing is about but are voting for her anyway. And of course, by nature of having a public thread I'm sure there are a few members or lurkers who have voted against you for kicks, but I doubt that this number is significant.
I got too curious about how she's getting votes and went to her Facebook wall. She's posting the link to her photo on random Company's Facebook pages and asking for votes, lol
Or of course we could have a situation like this! I'm surprised that tactic hasn't backfired on her, but I suppose you never know… In a way that's somewhat of a good sign, since it suggests she doesn't have a sure bet (necessarily) to score a whole bunch of likes if GAF secures more.
On another note, I never would've believed that some Facebook likes contest could be so entertaining!