This is the best article I've read on this story yet.
It quickly becomes very obvious that she killed those 3 people, where the only remaining question is whether she did it on purpose.
But the matter with the very obviously different colored plate, is very damaging to her.
And then the matter of throwing out a mushroom dryer that has traces of the toxin. A dryer she claimed she had never owned!
And the fact that she had used a website warning against the Death cap at certain sites.
And the fact that she had visited exactly those sites.
Giving children chocolate with dried mushroom in it, and remarking they didn't even notice!
Her story about throwing up after the guests left, but she still went to the hospital a couple of days later claiming she felt ill, but there was no trace of the toxin in her blood. That does not ring true either.
The invitation itself was considered a bit strange too, since it was not something she usually did.
And the fact that she had been suspected of trying to kill her husband before, does not help.
Seems to me the police did good work here, maybe because she had been suspected before? And the evidence against her is pretty overwhelming that these killings were intentional.