Actually, I posted an email by someone that knows her. I guess the woman could have been covering this up for her family, but she claims that indeed, this was Palin's baby.
I'm not a supporter of Palin, but I think this woman was telling the truth. Why in the world she'd put her unborn child in that jeopardy on a plane, etc, is beyond me, but hey, she had 4 before that!