I chose other. Letting her in, even if she is a victim, has problems. She could be so hysterical that she could be all over you (like a drowning victim with a life guard) and if the BG gets to you it could be bad. Having a spouse watch her is a good idea and one that may work. But again, if the lady is freaking out and a true victim but on drugs, she might start acting irrationaly and could make what appears to be threatening gestures or attacks which you may now have to defend yourself against.
If the BG shows up and it is the husband/boyfriend the victim may now not want him hurt and try to defend him. It happens all the time in domestic violence incidents.
The stock answer is to keep her outside and call 911. But experience, training, and your gut will determine what you will do.