Not only that, this article says:
"Also missing from his report is any description of the gun, its make, or its manufacturer. Consider that it was a pump-action shotgun, in which the user has to pump the barrel to load a shell into the chamber. And the shotgun was loaded when it was recovered, meaning that even after shooting her brother accidentally, Amy Bishop had loaded it again. Indeed, Officer Solimini says now that he recalls a hole in the downstairs ceiling where Amy Bishop fired another shell after shooting her brother, which would mean she reloaded it twice, and she was carrying an extra shell in her pocket."
http://www.wbur.org/2010/03/02/bishop-howe-reporters-notebook
I think this is outrageous. The article also says she " Or how she had managed to shoot him at such close range that there was only an inch-and-a-half hole in his chest and no spread of pellets?"
What kind of accident was it? At the very least they should have charged her for what she did at the dealership. Since she got away with all of it in her brother's demise, I would guess she could have been expecting to get away with what she did to her co-workers at Alabama. She'd say "I don't remember doing it" and they'd just let her go.
Thanks, JJenny, your post is well worth repeating. This sounds more like an angry execution than an accident. The absence of a thorough follow-up is frightening and inexcusable.