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Another piece that plays into this are past encounters. If the woman had truly been assaulted by the deceased woman in the past, then the prior should have known not to open the door, and called the police and waited. We also don't have knowledge of anything that the woman said prior to shooting the deceased woman that may have provoked the deceased into further escalation of verbal or physical violence. You can't incite a fight and then decide you are suddenly in fear of your life unless you try to abandon it and retreat. In the end, if the woman had made ANY kind of attempt at preventing the deceased woman from gaining access to her (shutting or not opening the door to begin with, etc.) and tried to deescalate the encounter, then she would have had a lot better chance at proving self defense.