When we bring newbies in sometimes they don't go to the box for 3 days, also are you using the sme type of litter some of them are fussy sods like that
Also is it the same type of food Lau was feeding, I would put a little down and fairly often if she isn't eating it and have a bowl of biccies and clean water down all the time so you can monitor the bowls
Early days and maybe just scared of her new surroundings