To kill 3 (almost 4) people is a brazen thing to do if it was on purpose, and very easy to make it look like an accident if it was with "mis-identified" mushrooms in a meal.
My question is: what was the relationship to the woman and the others at the dining table? Family? Friends? Colleagues?
And if it was murder, to kill intentionally, did she intend to kill all of them? Or were some of the others collateral damage?
The people who died or struggling to live were parents in law and the mother in law's sister and her husband. If there was a motive to poison them, I can only think that it could be over inheritance money (if she is only separated from her husband) or religion.
If she and her husband are only separated, she would still inherit money from her parents in law via the husband but why include the mother in law's sister and her husband as well? So in my mind, a possible motive could have been that the wife has not been accepted by them because she is not religious or has another religion but she has pretended to remain friendly with them in the meantime.
We now have heard history that her husband also suffered a gut illness a year ago. Assuming that it was she who was the cook and it didn't work, perhaps these four people were her next target.
One thing people are not talking about is her children. It looks as if they did not become sick but it is easy to say "my children don't eat mushrooms". But what I do find strange is that a host would not eat her own food and specially do a meal for her guests that she is not intending to eat herself.
When I invite people for a meal, I try to choose something that everyone is going to like. I like seafood so I ask my guests, "do you like prawns?", for example because not everyone likes them. If they said "yes", I am not going to prepare a meal for four guests who like prawns and then something else for my children and myself. I realise that if it was a mushroom sauce, it would be an optional add-on. I don't think she would have told her guests, I picked these mushrooms especially for you.
Has she told police where she got the mushrooms from yet? Did she pick them or buy them?
I also think that the police could be looking at the hydrator to see if any poison was added as well as the toxicity of the mushrooms.