Ellie is adjusting quite well! She is eating like a real chow hound, using her litter box, scratching on her scratching box, not hiding under the bed when I enter the room, and being a sweetie.
I have been sleeping downstairs in her safe room to contribute to the bonding process. She sleeps with me, sometimes under the covers and sometimes on top of them.
One thing she does with passion is vocalize. It has been many years since my ears have been hit with the Siamese yowling. She has many tones and expresses herself succinctly.
Today I locked up the other cats and opened the door to her safe room. After about 5 minutes she ventured out. After a time, she came back downstairs to check on me.
Since I was obviously getting along without her, she continued exploring upstairs. Immediately she found the 2 favorite spots of the other cats: sitting on the chair under the dining room table, and the cave in the cat tree.