In my opinion, the teacher's primary mistake was leaving the gun in her vehicle when she knew the students would have access to the vehicle.
I am not familiar with Ohio's gun laws, but here in Virginia, an unloaded and locked up gun secured in a vehicle on school property is fine. But even here, allowing students access to it (even just access to the locked case) is a HUGE no-no.
My guess? She will probably be fired.
According to Switzerland of Ohio Superintendent Larry Elliott, his office received a call last Thursday that a gun was found in a teacher's car at Swills Hills Career Center.
"Evidently, a teacher had left their hunting gun in their vehicle, and we immediately contacted the sheriff's office, and the sheriff's deputy went and immediately took the firearm into his possession," Elliott said.
http://www.wtov9.com/news/news/superintendent-gun-found-teachers-car/nTL2x/