Why didn't Hester Shaw just ask Shrike to kill Thaddeus Valentine?

In Mortal Engines, Hester Shaw runs away from Shrike's care once she found out that Thaddeus Valentine was in the area in order to attempt to assassinate him.

Why didn't she just ask Shrike to help her?

plot-explanation mortal-engines

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What did Hester promise Shrike?

Hester explains that Shrike had found and raised her after escaping Valentine, and Hester promised to let him turn her into a Stalker like himself, but she left after discovering that London had entered the Great Hunting Ground, giving her a chance to kill Valentine.

How old is Hester Shaw in Mortal Engines?

Hester ShawHester Shaw Hester NatsworthySignificant otherTom NatsworthyOriginOak IslandAge15 (Mortal Engines) 17 (Predator's Gold) 33-34 (Infernal Devices/A Darkling Plain) Twenties (film)7 more rows

What is the promise in Mortal Engines?

Hester left Shrike to avenge her mother's death, breaking her promise that she would stay and become \u201cresurrected\u201d like him.

Why Didn't You Stop Me?

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