This just shows how easy it is to kill someone during a moment of rage which sees any ability to think logically and clearly turn into red mist.
Instead of calling police saying that she thought her boyfriend had come back to kill her and hiding somewhere, yes, hide and use gun as last resort, or just running out a back door, she just blindly shoots the person on the doorstep.
Send her to the chair.
I don't think she needs to go to the chair. I think living with what she has done would be far worse.