What I enjoyed most, in the end, is that although Gemma-Kate is

proved not guilty of poisoning anyone (including The Pug), she's still not innocent.

Brigid sees that she will somehow have to play moral compass for her niece, which will be a struggle for them both when Brigid obeys the spirit of the law on the best of days. You rarely see someone in fiction with malfunctioning empathy as a good, or even neutral force.