A Writing Challenge, answered

Robin over at Big Window called my attention to a writing exercise that seems useful. The challenge is to write something while looking in a mirror, and not use the word "I." Here's my first go at the challenge:

Mirror Girl

Who is she?
She is not the she from yesterday.
Will she still be here tomorrow?

Is she only a brief visitor --
as fragile as the glass reflecting her?

Look too closely,
and she becomes unfamiliar --
a collection of crumbling parts.
But squint a bit,
and you might see the she you remember.

This looking glass
is meant for looking --
not dissecting.
Go ahead and squint.