After we left on Wednesday evening, Zoe apparently lost all bravery she once possessed. She hid in Mary's closet; she hid under Mary's bed. She crept out to eat some breakfast on Thursday morning, although not a lot, as she was starving and scarfed down food once she arrived back home on Thursday evening. We assume she used the litterbox when she was there, as she didn't rush upstairs to use it, when she got home.
She's still going back there during our honeymoon though--she's almost eleven months old and quite a big girl. She can learn to deal with her parents taking a vacation. =)
(Plus, the company of Mary and her husband, plus Maggie and Marlowe, will be good for her. Much better than sitting at home and being bored all day.)