I wonder if I've been changed in the night? Let me think: was I the
same when I got up this morning? I almost think I can remember feeling a
little different. But if I'm not the same, the next question is, Who
in the world am I? Ah, THAT'S the great puzzle!' And she began thinking
over all the children she knew that were of the same age as herself, to
see if she could have been changed for any of them.

'I'm sure I'm not Ada,' she said, 'for her hair goes in such long
ringlets, and mine doesn't go in ringlets at all; and I'm sure I can't
be Mabel, for I know all sorts of things, and she, oh! she knows such a
very little! Besides, SHE'S she, and I'm I, and--oh dear, how puzzling