Diana's muscles loosened visibly when Liam said that she could stay. Sure, her instincts had only a minute before been screaming at her to get out of this place, but now that it was clear she wasn't moments from losing the majority of her brain to a shotgun blast, logic was creeping back into her. It wasn't safe out there; anywhere and at any moment she could be ambushed by a walking corpse or jumped and robbed by people desperate for supplies or used to repopulate the Earth or cut open and fed to someone's starving children... The bottom line was that the world outside this house was a mess. The young men before her seemed fairly rational (whether they were psychopaths was a hurdle she decided she'd jump later) and hadn't slaughtered or try to enslave her [i]yet.[/i] With any luck, that was a good sign that they wouldn't. 

One foot returned to the main floor while the other stayed, unsure, on the step. With a quick look-over at Liam and Isaac, Diana decided that they were [i]probably[/i] trustworthy. Or at least there was a reasonably good chance that one of the two would be. Judging from the mess the world was in and their merciful attitudes (she was willing to forget the gun part) these seemed to her like pretty good odds. 

"Thank you," she told Liam. "I swear I won't make any noise and I'll pull my weight, and all that." She nodded gratefully at him and then at Isaac. Then, finally losing her nerve, she hurried up the stairs.