Go and investigate, A. But she should tell Sublime, and have her follow her right after dressing. How long does it take anyway, no makeup or anything lol. She should be right behind her as our heroine leaves. I mean, if there was a zombie here, it would've shown up. Also, if there are any elsewhere, it's unlikely they'll enter the house, but rather will probably go to the scream. And you have an assault rifle, so the few that may be in the town are no threat.
So rush over, and have Sublime follow. Manpower is good. A