Well, I suppose as you say
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Atwood did it because she could.
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My interpretation is probably too obvious because of course the story is full of various deaths, not only the two murders at its centre. Perhaps Grace is a person surrounded by the deaths of others, and the question is whether she is responsible for any of them.
It could be to do with moving through life towards something: in Grace's case, towards freedom. Dr Jordan certainly seemed for a time to offer her best chance to achieve that.