Oh, I was not clear. Sorry. I know she likely meant that she knows they were doing the horizontal polka that particular night. How she knows, I do not know. Especially since they do not seem to recall doing it. But Kolby does......
I just found her use of the term procreate for what she was attempting to say, amusing. Copulated would have made more sense. Or rather, in Kolby's world, "made more since."
Time travelling, so I am guessing someone already worked this out.
But the Schrodinger Kolby episode was in December.
So they ran away and said she was dead so they could have sexytimes.