Tonks pretty much spent the first 24 hours at our house hiding inside the box-spring of the bed in our guest room. Eventually she let us visit with her a little bit at a time.
Tonks is eating, drinking and using her litter box just fine. She doesn't venture far from "her room" yet. We are letting her do things at her own pace.
Miss Katie is VERY curious about the kitty. She goes to the door of Tonk's room and sniffs and sniffs. Occasionally she barks. I get the impression she's mostly trying to tell us "Hey! There's something IN there!!"
We are introducing Katie and Tonks slowly. A few well supervised peeks at each other is all they've been allowed so far.
I'm sure I will soon have plenty of adventures to tell you about regarding our fur-kids.