Shelley Harrison Reed posted a photo of her daughter Vanessa with the words 'Love Mom and Dad' written on her arm in purple marker.
Reed already knew from her 10-year-old son that their Delaware school had been under lockdown during a portion of the day because of a bomb threat.
When Reed noticed the strange message on Vanessa's arm, she asked her daughter what it meant.
The second-grader explained she wrote it to let her parents know she loved them in case she was killed.
Reed wrote they both started to cry as she watched a piece of her daughter's innocence "get stolen away."