No, Zara put that bag there when she had breakfast in the kitchen before leaving. And it seems to me that it was an envelope where she put the last things used before leaving (beatycase, hairbrushes, etc.)
Maybe I'm wrong ... I have the feeling that Kassandra and Tim have known each other for some time. There is a feeling between them from the first day: caresses, kisses, confidences that Kassandra does not refuse. Maybe there was already something between them in the past ...
In my opinion, RLC allows this hiding: a hammock has been placed in the blind spot in the backyard. It can be seen in the daytime reflected in the glass door of the hall (cam 3-15)