She cannot imagine screaming. She knows what it should sound like and the general idea of the emotion behind it, but she doesn't know how to arrange her face, to bring the sound into reality. Inside of her she feels the scream, ricocheting off of her organs, tearing them apart with its violent need to escape.
However the scream is forever trapped in her body, a prison to both her emotions and her soul. She must hold her scream back with the a smile to help prevent the bile rising in her throat from escaping.
On the outside she remains calm for she knows that it is only internal bleeding. But how long before she leaves a smear of blood in her wake? That thought alone compels her to continue to fight, to succeed in the battle of mind versus heart.
However she turns off her alarm and realizes that the day has just begun and she is already mortally wounded.