Resist the urge

It takes all of your willpower, but you decide to resist your first instinct. She throws panicked looks around her as she taps lightly on your door. Seeing the fortifications around your yard and the boarded up windows, she (correctly) assumed that there could be some survivor holing up in this house. Her knocks are so quiet that you almost didn't hear them; She obviously doesn't want any of the undead shamblers to hear her.

You should help her, probably. But what if she's infected? Or worse, what if she's a marauder, and tries to rob and kill you!?

Her movements become more erratic, and you're guessing that some ghouls have spotted her. Her taps turns into knocks, and you faintly hear her voice through the door as she begs to be let in. You can't help her, you don't have enough resource for two.

The peephole cone of view is pretty narrow, so you only see the zombies once they reach the sidewalk right in front of your walkway. There are two naked buff green men, and they're making their way towards the door. The woman is openly sobbing now, and frantically hitting your door.

There are probably even more zombies out of view, so letting her in would be very dangerous and would probably just lead to the both of you dying. Right?