I find this whole thing ridiculous.
Okay, even if the other nurse saw Lorie give the injection, how should she know what it was?
Standing over a previously-dying (now dead) terminal patient is not illegal, nor is giving a shot of morphine. Frankly, unless they have toxicology reports and have ruled out the other nurse, this is a horrible injustice to all involved.
Cases like this are exactly why grand juries were outlawed in England in 1933. They are basically unheard of outside the US, because it's an easy way to rail-road someone. If the DA can't muster up enough legal evidence to try the case as-is, it should be over. No multiple grand juries to see whether someone even could be guilty.