Thanks again, everyone, for your sweet words. I was trying to make my post cheerful, but I guess the sadness is still dominant right now.
All that talk about getting Celia a playmate...I looked at Margaux's picture (the one on top of the box with her ashes), a couple of months ago, wondering if she'd be ok with my bringing in another cat. I was surprised, honestly, to get the distinct, and very strong, feeling that she didn't like that idea at all. Then it made me smile: Margaux was always such a princess. How could I possibly be thinking about bringing another cat into the house? And not even a year since she'd left! When I looked at her pic again over the weekend, I didn't get the sense of her being regally offended but of her being a little sad at the idea. So no kitty, foster or otherwise, for now. I'll have to try to become a better cat so Celia can have a playmate.
I never even acknowledged DebS and MM's posts from July! I just don't like to look here too often. Everyone's kindness always makes me cry.