The tale of the invisible little girl...

She always sits by herself at the back of the class, in a shabby pinafore dress that saw better days.
Whenever she raises her hand to answer, the teacher ignores her. At lunch, she stays alone, invisble.
At home, no one notices her either, all too busy and sorry.
Her favourite hiding place is her mother's room, now cold and emtpy. There is a picture of a smiling woman and a pretty little girl who looks just like her.
She vaguely remembers that the little girl drowned. That night, her mother stopped smiling and walked into the sea after her.