"Wait, we can't just leave. We know she didn't do anything wrong, and I really don't think she should be alone right now; not when she feels so vulnerable. We should at least tell her we don't believe she's bad luck, and we want to help."
Usagi brightens up at the suggestion, "Yes!" She runs up to the door, cradling her cat in one arm, and pounds on the door, "Rei, Rei!"
You catch up with her and motion for her stop, "Rei, you don't have to come out if you don't want to, but neither of us believe you're bad luck, or that you're responsible for Mii's disappearance. We want to help."
You press your finger to your lips, telling Usagi to be really quiet. You press your ear against the door and listen closely. You can just barely make out breathing on the other side of the door. It's safe to say that Rei is right there.
How do you wrap all of this up in a nice bow?>Write-in for massive relationship boost. [What?]