Thank you, Heidi and Elyse.

Neither Sparkler nor Galaxy is an aggressive-type cat.

Galaxy is in the bathroom (door is open). She is facing forward in her carrier right now. She's eaten most of her dinner so far.

Sparkler hasn't eaten any of her dinner, so far. Usually she eats this (Pro Plan Turkey & Giblets Entree) just fine. She did come from the bedroom to the living room (past the bathroom door). Now she's gone back to the bedroom (past the open bathroom door). The bedroom is where she has HER caves to relax in!

She was just sniffing a piece of towel that had been lying next to Galaxy. Yesterday I gave Galaxy a towel to sniff that Sparkler lies on a lot. So they've been introduced to each other's odor.