She smiled, a moving childish smile that was like all the lost youth in the world.

When you were born you were crying and everyone else was smiling. Live your life so at the end, your're the one who is smiling and everyone else is crying.

Her face is beaming, lit from within by a memory. (p39)

when you came you cried and everybody smiled with joy; when you go smile and let the world cry for you.

Why do you want to die?'
I shivered. For a second I couldn't breathe.
'You knew...?'
She gave a sad smile.
'I'm your mother.

The shape of her smile is curved like a lie, like a boomerang she knows she has to catch quickly when it comes back to her.

her “smile” — as an expression of her loving disposition toward God — in spite of her feelings.

It's a smile a girl could bring home to mother, if she had a mother; a smile a girl could pet like a pony, sip like a lemonade, hum like a popular tune; a smile a girl would feel safe with in a dark alley.