I think the amounts were much less than what we were told. There may have been an exaggeration about the amount taken or a misunderstanding when the amounts were conveyed to mom, but either way, that was our source other than the letter from the second pathologist. The amount in her blood could have been explained, as the first pathologist said, but the amount in her gastric contents pretty much blew that away.
Last night in a comment on the blog TI stated that someone told her the autopsy was out there and implied that she didn't know what it stated, so I'm under the impression that she never asked for or received copies of the actual autopsy, but rather got her information from phone conversations, which are easy to misunderstand or mis-remember.
For instance, mom insisted the second path said had been liquid ami, but his report doesn't state that. I can see the conversation being something like him explaining the amounts in M's system and mom asking if it could have been liquid, and the doc answer that it could have. In mom's grief, that's what she latches on to; it must have been liquid ami, therefore she didn't kill herself, and therefore it was murder.