Cunning Fox Among the Doves

Eleanor Brock married the Regent and, to secure her position after becoming pregnant, decided to choose a sister from her family to enter the Governor's Mansion.
I, the youngest, was selected.
She believed I was a docile and weak little rabbit who posed no threat to her.
But what she didn't know was that I was actually a cunning fox who had hidden her tail.
All of my apparent weakness and harmlessness was just an act.