In this case we ask the same thing: what happened that caused things to go so wrong on this set, and what can we change to prevent that from happening again?
What happened? She didn’t do her job.
How do you prevent it from happening again? Make sure there are repercussions for not doing your job. Something like maybe jail? That’s a pretty big deterrent.
Edit: I’m not big on sending people to jail. I do believe sex crimes, and violent crimes are 100% jail worthy. Drugs, theft shit like that, no. If you get someone killed because you didn’t follow what you are contracted to do, then yeah, I think you need to go to jail. Not for years, but 18 months, that might be a little long but it’s not unfair. You took a life.