Read somewhere that the armorer removed the shell casing after the shoot and before LEO arrived.
If true, she just added obstruction of justice to her part in a negligent homicide.
I don't know what the legal term is, but as it looks now she, the AD who gave the "cleared" gun to Baldwin and Baldwin himself are each 100% responsible for this. It cannot be divided into thirds and then rounded down to zero. The only way she and the AD get off is if they gave a verified cleared gun to Baldwin and then he loaded it without their knowledge, and I do not believe that is what happened.