Sometimes the truth hurts.

I think you guys are all on a lark of speculation right now about her being in the costume, but I really do half expect some EU "explanation" for her facial deformities--like Luke's in-Universe face-change explanation in ESB.

Maybe they'll say the one-armed Wampa, seeking revenge, sniffed out Leia's "Force" which bears a sibling's resemblance to Luke's, and then swiped off her kisser, leading to semi-successful reconstruction by a rookie surgeon-droid in a hilarious darkly comic episode.