Leila Whitecrest

A spy for the Silver Eagles of Inveresk, sent to keep an eye on the Black Fang. She was known to them as Lorelai Harper, the Red Fox. She was discovered as a spy by a young Wildcat, who caught her meeting with her fiancé, Matthew Harper. 
Lorelai decided against eliminating the Wildcat, as the girl was barely able to speak at the time, but as she recovered Lorelai realized Mara was somewhat enamored with her, though the girl didn't seem to know it herself.
She never learned that Mara did reveal her secret to Reed; ultimately this did not matter, as her execution at the Angel of Death's hand came at the order of another.