Olive did it

I say, Olive did it. Otherwise, how can you explain why Olive has the image of slashing with the sharp and shinny knife when she sat along?

Also, if any of you remember, at the end, when the godfather opened the 'gift' given by Olive when they did the 'farewell', the gift was the sculptures of olive's mother and sister. and, when the scultures fell off from god father's hand, they became apart in exactly the same way as the crops that were cut into pieces. That is a message telling you Olive did it.

Bescides, more in detail, did you notice that Olive behaved in two different ways when she was talking to Roz and when she wasn't. When she was talking to Roz, she behaved as she was so helpless and innocent. However, when she wasn't and especially when she was along, her looks were firm and grave. I suppose you can think of why.