Here is what he wrote back:
The film opens with the flashback of young Lily watching her parents from the floor of a closet. The scene unfolds from her point of view. You see the arm of the young girl first, holding a small mirror (I think) then gradually the young girl's face comes into view in the reflection. I was aware of the situation with the two actresses playing the one role, so I did watch carefully; it was sort of obvious to me that the arm belonged to a younger child. Most viewers probably wouldn't notice this, the sequence was put together pretty seamlessly.
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You see your daughter's face for what I would guess is between 5-10 seconds---not terribly long, but long enough to establish who is watching the struggle between the two adults. I would describe her expression as somewhere between frightened and bewildered by what is happening in front of her.
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After you see the child's face, the physical struggle takes place, a gun hits the floor, and the child picks it up. After this flashback/memory, Dakota picks up the role.
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You do see a photo later of young Lily and her mother. I'm assuming this is your daughter as well. Again, you see the photo briefly, about 5-7 seconds.
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Hope that helps. Congrats on your child's part in "Bees", it's a fine film.