It's recommended that you keep her indoors (which will entail the use of a litter tray) for about 2 weeks but this is really for moves to a totally new area. I would definitely keep her indoors for at least a week though, or she might simply go back to your old home.
I don't think I'd use a cattery for just one night, especially as you are only going across the road, why not just carry her over - either in a pillowcase (wrap her body up in the case, but keep her head clear so she can see what's going on around her) or in her own cat carrier. If you take your time crossing the road, constantly reassuring her, she shouldn't find it too traumatic. After about a week, you could accompany her out of the back of the new house, to let her explore the area - just make sure she is hungry when she goes out, so that she will come back to you for food.
My little thug got lost recently - I found her about 500 yards up the road, totally disorientated. She wouldn't let me pick her up or cuddle her, so I simply called her and walked slowly back to our home, constantly talking to her and stopping if she did. She followed me home and has been fine ever since.