Because she was scared of him.
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It is Silena Boureguard, near the end of the Last Olympian, right before she dies she holds up her wrist and she holds up her charm bracelet with the picture of the scythe. Though she was a spy, she sacrificed her life to make things right.
It's a scythe charm so she can be a traitor and tell Kronos Percy's plans. Though she made this bad choice, she sacrified her life to make things right.
Her name is Silena Beauregard.
Silena's age is never revealed in the Percy Jackson book series.She is played by 19-year-old Zoe Aggeliki in the film Percy Jackson and the Lightning Thief.
No she is not mentioned in The Lighting Theif