If she'd just said from the beginning she went foraging for mushrooms, thought she knew what she was doing and made a "terrible mistake".
I think that's what I find most disturbing about this case. Her lies and deception after the fact is what tripped her up. I read the article where the doctor treating the victims stated he knew it was her once she said she bought the mushrooms at a supermarket. No one was dead at that point so her reasons to lie if she was innocent were nill and as they already knew it was mushroom poisoning, and absolutely no way they would have been bought in a shop, it was such a terrible lie. If she'd said straight away she'd been foraging and not tried to lie her way out of it, I genuinely think she'd have gotten away with murder.