You completely contradict yourself in your last sentence by confirming the very point I made...
You should probably rewatch the ending before critiquing someone else's take on the ending. 
She was completely at his mercy with not an ounce of spine to claim justice.
No, by the end of the movie, he was completely at
her mercy. Gregory is tied up and helpless and can only be freed with Paula's help. At first, Paula claims that she would help him. Ingrid Bergman is brilliant at portraying the ambiguity of her actions to the point that it actually looks like she might help him.
But, then she "feigns" insanity, saying that there was no way an "insane" woman can help her husband escape. As a desperate attempt to win her over, Gregory is the one to admit that she actually
isn't insane. It's at that point she really twists the knife (so to speak) with her final speech, "If I were not mad, I could've helped you..."
of course he had it coming to him however it was delivered but, preferably in a more convincing way.
Paula is absolutely sure at that point that she isn't mad, but plays up the dramatic irony so well! That is her real revenge. How much more "convincing" do you want?
Sure, Gregory deserved worse, but at that point Paula needed to get on with her life and violent vengeance would've taken that away from her.
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