I think, rather than her performing style changing... it's something more like how the song relates to her.
For example, in AT 03-04, you don't see her smiling to the audience in Memorial address. That's because she's relating to the lyrics, and feeling for them.
For appears, I suspect it's because of something to do with Tomoya Nagase. I mean, it's quite a sad song after all... maybe she couldn't take the stress that's why she looked so serious and solemn while performing. And Shu-ya looked sooooo sad too (maybe he was also nervous cos Ayu looked so serious) so, I guess at that time, appears was something sad to Ayu... I don't think she's that kind of a person who would smile for the sake of smiling.
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