It sounds like the man was within his rights to be armed on his own property and the cops had no right to arrest him for it. That being the case, the woman had a right to point the shotgun at the police and should have shot. “Authorities” acting outside of the color of law are not protected by it. They were kidnappers at that point, not police officers.
This doesn’t fly in court. Woman would be sentenced to death if not killed in shootout.