Hmm, mine is a little different. I don't get any choice in the matter, she simply lunges at me with a knife. It's probably since I had just activate Jun right before, so I guess the save is softlocked since Jun can't help :/
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I'm gonna guess that her Sympathy for you is really low because her Temporary AI just kicks in. If her Sympathy is high enough, the game should give you those 2 choices. And Jun might need to have Both Arms and Legs. Well, at least, of course, she needs both Arms. Other wise how will she gonna do a karate-chop?
I didn't even know about this, and I just realized that Jun might need to have both Arms and Legs. I thought the game will give you 2 choices for you to choose anyway. I never encounter this myself because I've been playing this game for so long now. On every playthrough, I always manage to get both Arms and Legs before that Woman finally comes to attack. I also can't be able to make Jun hate me too. I still haven't figured out how.
I think I managed to bypass it. I got lucky and went outside for a walk and the weather turned cold, just like when she's about to enter the house, so she probably came and left while I was on that walk.
EDIT: After more testing it seems I can avoid the event by staying outside between 6pm and 12am. Then I spent a few days boosting Jun's sympathy since she had just activated advanced ai until it was enough to take care of the girl.