Gretchen told me to put Ruby in the car and come back in. I sat down on the opposing bench, at which point Sunshine hopped down, walked across the aisle, and hopped up on the bench next to me. It seems that I was also on the list of "her humans".
So we have a cat. Pictures will follow, I'm sure. Right now, we're working through the acclimation process, getting her and Ruby used to each other. We'll see how that goes.