Look up the definition of innocence, Ellie has much more knowledge about how to act in different situations than many children her age, she is cunning, sophisticated, harmful, she's not simple and she isn't naive, all of these traits contradict the definition of being innocent.

Even though I feel that 'innocent' isn't a word I would've used to describe her she does have some traits which fit the definition, she's straightforward, she isn't evil and she is young.