It's very possible Christie only said these things because she didn't want to hurt her best friend further and make her miserable again, so she played down Emily's weight problem.
Jess on the other hand has nothing to lose, so she's more likely to blurt out her honest opinion.
People are more likely to tell others what they really think when there are no consequences.
Why would Christie,
her friend, want to hurt her feelings in the first place ? Your argument is going to be "she was just honest about Emily being obese" and no. Doesn't make sense.
Also Jess would be honest because she has nothign to lose ? Please. Jess has a mean streak and wants nothing but hurt Emily. She's not going to be honest, she's going to exagerate, lie and make shit up to hurt her.
I'm starting to think either you haven't finished her events, or you just plain don't read the game. You are way off on the whole thing, to a scary degree, honestly. None of those girls are anywhere near fat. You just use carefully selected arguments and snipets of dialogue to reinforce your point and use slanted logic to undermind proof of the opposite...