How do you know the couch is unfamiliar? Are these furnished apartments with all the same types of furniture? Does his couch look like her couch?
When you are startled by finding someone in your apartment, do you have the presence of mind to realize that he's just eating ice cream?
I am scared and confused and back out. That’s it.
Now this part I fully agree with. If she's in the doorway when she sees him, a normal reaction would be "Oh Sh*t! Someone's in my apartment! Let me get out the door and then asses the situation!"
This is where she exhibited bad judgement. Bad luck brought her to this confrontation, but bad judgement is what killed a man and ruined her life.
How do I know? The whole place was furnished differently. They are not furnished apartments.
In re the ice cream eating anything out of a bowl- murderous intruders don’t sit there and eat out if a bowl while hunting.