Belz...
Fiend God
The intent to shoot was to stop an intruder in her apartment, this however was only able to happen because of the mistake of fact, of entering the wrong apartment.
That's why it all hinges on whether her initial mistake was reasonable. I find that it was not.
However, since there are several possibilities other than "intruder" in your own home when you're not there, and since the situation is reversed (you entering, the other person already there) I find it hard to support shooting EVEN IF she had been at the correct appartment.