Honestly I know of the problems within Islam that lead to things sort of like this. But in this womans case it was clearly mental I know of people who said Jesus told them to kill themselves. Or that Mother earth did or their dead mother. I have heard several cases outside of Islam where people have become convinced to commit suicide or kill others either hearing voices or getting strong violent urges.
Unfortunetly there is little that you can do to prevent these cases. Unless you diagnose the problem early enough that family should have staged an intervention and gotten the women mental help. But honestly this is a common occurance and most people do not get the help they need in time to prevent these things from happening.
Honestly I don't think this women is evil or should be killed or such. However I do think she should be confined for her own safety and the safety of those around her. She should recieve treatment and mental help until she dies. She did not appear to be doing this of her own free will, she is mentally incapable of taking responsability for her actions.
I have never been in the situation myself (Hearing voices or having an over whelming urge to commit a crime) but as someone with a mental disability I have met many with those struggles. I realize what she did was horrible but you can't say (Send her to meet satan) she was obviously mentally disturbed.
-JC7
"In God We Trust - In Games We Play " - Joel Reimer