[@Phantomlink959]

Verbalized spells/spells that require material cannot be replicated
Her biggest drawback is that she has to visually see the person execute the action from beginning to end. If a person were shifting she'd have to see them enact their ability to shift and can only shift as that animal until she can register another. Her replicas aren't organic either, again taking from the example of a shifter - If she were to say use their ability to shift it'd be a mirror/porcelain copy that can shatter, or if it were plant manipulation; Someone grows a beanstalk from the ground, Essie can do that but it isn't organic. Magical abilities on the other hand can be replicated so long as it isn't a mentally corrupting force, she is technically a being with 'energy' therefore she can use/cast 'energy'.
Sorry if this makes absolutely zero sense, I'm not entirely coherent at the moment. And also apologies for not specifying either, I could add these things to her character sheet or make edits if it isn't acceptable.