Is a girl to be executed along with the murderer who killed her mother and brother, given that she consented to the killing and helped him?

Murder is one of the gravest crimes, and killing a relative is even more sinful. Consenting to murder is a spiritual participation, for whoever approves of a sin is like one who witnessed it, and whoever incites it is even more sinful. Regarding retribution (Qisas) for the inciter, the inciter is not to be killed unless they had actual physical participation in the murder. If they did not have actual physical participation, then Qisas does not apply to them, but rather disciplinary action.