I had a quick glance bearbear
(Had to glance, the Tween was around, he just shouted out to my Understanding Partner, "Mum looking up about People who do Poisoning Dad.")
I noticed, Marquise de Brinvilliers, Marie- Madeleine d"Aubray, (1630-1676) was not on the list, her I ,IMO seems to fit the current situation, A small, dainty softly spoken, high born French woman, who is believe after her trial , supplied food/aid at Hotel Dieu (Hospital in Paris) where her kindness was highly praised, in reality she was testing out poisons on the Patients, believed over thirty Patients died number could be more,(I read about the case years ago, they say mainly 30 they know of, because the patients had recovered ready to go home they relapsed after the Marquise de Brinvilliers treats of cake and jelly. Next came her servants ill or died, before she went on to poison her Father and Two Brothers.
EP Husband health problems IMO it never crossed his mind, that Erin was behind it, why there was no warning giving to his family before the fatal lunch. He could just had a bad gut feeling acted on it hence no warning was given to his family.
Erin does not look or act like a threat. Which it reminds me of the Marquise de Brinvilliers people were stunned when she was arrested. IMO
Again you are correct bearbear, the Marquise de Brinvillers did her crimes for money
Which gives me thought, that over the years people over the years if they crossed Erin, did they come down with a spot of tummy troubles, After the trial I wander if this information comes up.