I'm not certain what happened by any stretch. The vast majority of people are going off 2 theories:
1) it was an accident
2) she planned to kill all 4 and probably 5 had Simon attended
I find issues with both of these that are extremely difficult to overcome. The top one requires a considerable amount of misfortune on the part of EP with a significant degree of lying.
I've explained many times my issues with number 2. It seems extremely illogical for a number of reasons nonemoreso than the lack of planning after the murder. I argue that there is a 3rd possibility:
3) she wanted to poison them but underestimated the effect it would have
The reason I find this appealing is because it covers a lot more of the problems that 1 and 2 have. It explains the lack of planning, the lack of motive etc whilst still explaining all of the lies and coincidences etc. I've also indicated that most of us suspect she actually did poison Simon a year earlier.
Of course like any theory there are issues. However, I find it easier to believe that EP underestimated the effect of DC than that she killed 4 people based on some pretty mild grievances and then didn't think she would be suspect number 1.
I see your point.
But I think, if this was intentional and she's found guilty as charged, she had full confidence in the product.
Here's how she may have planned it. And I feel authorized to speculate because Mr. Mandy wants the jury to consider how a reasonable person would have murdered better, or such like. His logic hurt my brain, but I'm going to lay out what I think may have been marinating in EP's brain.
Six prepared BWs, one untainted.
Even though SP refused to come, I really think she planned to coerce him into dinner, with
the children. He would get the fifth BW,
the children plain beef.
Everyone but the children would get sick, and EP would match them symptom to symptom. Covid, flu, a touch of food poisoning, everybody would take to bed and bathrooms, would experience an upswing of feeling better, then crash and pass away. They themselves would never even consider poisoning as EP too would mirror their experience. A little salmonella for everyone.
If MEs sought a cause of death, by autopsy, there'd be no detectable toxin. Invisible murder weapon.
She just had to cross the 48 hour mark.
But SP didn't budge. Didn't eat a BW, didn't get sick and was alert enough to direct the others straightaway to the hospital. Methinks that after his harrowing illness, he didn't mess around with bowel issues -- and sent his aging parents to the hospital. Which triggered scrutiny. And now EP has to present. Prior, she only would have needed to convince
the children and SP that she was sick too but now the hospital staff was asking question that pedantic answers didn't pass.
She didn't have an after plan because she was confident in the 48 hours. Didn't think it through.
And then it became a scramble to pitch evidence, appear sick and stalllllllllll.
And here we are.
JMO