Grandmother: Innocent Or Guilty For Shooting her Grandson?

In the city of Detroit, This Grandmother claims she was afraid for her life as her grandson 17 year old Jonathan Hoffman was under the influence of a weed substitute drug named K2 (synthetic marijuana).   She said she heard stories of young men turning psychotic.  This all adds up until you listen to the 911 call in which the boy sounds totally helpless. Sandra Layne shot him as he was on the phone with the dispatcher. During the trial, in the courtroom she cries as if she did not mean to.  However the recording shows other evidence of an intentional murder for which she is accused.