User blog comment:DementedP/Isayama's take on Episode 23/@comment-179280-20130915222008/@comment-7418318-20130916080321

Since you pointed out that she started to laugh after being called the female titan I just noticed something else.

Maybe she's in part laughing because the burden of having to lie to people she likes is finally taken from her on top of what you already said. Finallly she can tell someone the truth.

I'm just glad they left the short sad expression she made between the fit of laughter and the maniac grin when attempting to transform the first time in, though as I said before having her shed some tears would have been a nice touch.