Sentence:  Christie blinked, then looked at Steven. “Do you have any idea what might be different?” “Um... No? Christie <WSD>facepalmed</WSD>. “Well, her hair was red this morning, right? It's blonde now. You figure it out.” 
Meaning of the word marked with <WSD> tags:  To bring the palm of one's hand to one's face as an expression of mixed humor and disbelief, disgust or shame; for example, when one is caught off-guard with a particularly bad pun.