Saelune said:
From what is known so far, I dont think she should go to jail. I'd imagine all the other consequences of the failed stunt will be more than sufficient punishment. Loss of a partner, child likely messed up, etc.
Reckless Endangerment of a minor (shooting a gun near one); Discharging a firearm in a residential area (most places have laws against that, depending on where they were simply standing, she might've broken a law); Involuntary Manslaughter (acknowledges the accidental, but doesn't mean you get off without punishment), Firing the gun without a license (not sure if she's licensed or not, given it was the guy's idea, I'm guessing he was the gun owner, so she might not even be legal to shoot it.
There are a myriad of laws that she likely broke, regardless of if she intended to kill him or not.