I had posted that I found the mushroom that took my Honey from me ... but after much research this weekend, I have discovered that I was wrong. The symptoms of the mushroom I thought I ID'ed are not what my Honey suffered the night before she passed.
Honey's symptoms - TO THE LETTER - were that of Amanitin (Amatoxins) poisoning. I have looked through the many different species of mushrooms containing this toxin and so many of them look similar, and look quite a bit like the one I think I have mistaken for the Cort. rubellus.
It now appears that whatever these horrible things are, they are either of the Conocybe or Galerina family.
Here is a page that covers all poisonings and the mushroom families. Worth a read.
http://www.namyco.org/toxicology/poison_syndromes.html
So my obsession continues ... but I WILL find out exactly what kind of mushrooms these things are. I need to know, as i'm hoping it might grant me even a tiny bit of closure.