Is it just me or does it seem like a lot of people miss an important detail in the episode. the ponies in the show missed it.
The first night: the bats destroyed the apples
The first day: Twilight and Fluttershy did their thing
The second night: something other then the bats destroyed the apples
The second day: normal Fluttershy was there with her friends
I could be wrong but I keep seeing comments in Flutterbat stuff that makes me think that people don't realize that she changed back on her own the first time.