Thanks for the advice! I've certainly made no moves to thrust the two together. Izzy is still confined to the bathroom, with a bit of cardboard slid under the door to keep her from "digging" at the carpet. She was only digging last night, though. Today she's been fairly quiet.

Zelda seems a little less mad at me, but she's definitely ignoring the bathroom right now. We just finished a little nap on the bed together, and just a minute ago she hopped up on the keyboard and lay across it like she normally does when I'm trying to type something. So I guess that means I'm forgiven for the moment.

I figure I'll have to pop Izzy back in the carrier in the morning when I get a shower because Zelda likes to follow me into the bathroom and wait on top of the toilet until I get out of the shower.