Slipping into Madness

E2: The Cheshire Cat

Write a short story or poem of a most cunning person with the phrase “with the grin of a Cheshire Cat” used somewhere within. (<1000 words) or (<40 lines)

She had ears like a fox, and had eyes like a shark
and the grin of a Cheshire Cat.
Her voice when she spoke held the tongue of a lark
but her words held the snark of a bat.
She would topple in trouble with every remark,
and then topple back out just like that.

Line count: 6