Good news! I got an email from Cat, in response to my March 11th email inquiry.
I know she'll have much more to tell you all when she's back online, but in brief...
She said the surgery went well, but her recovery has been slow. She was in the hospital for 2 weeks (much longer than was expected); her back was in worse shape than they thought. She's still in a ton of pain and must rest a lot. (When she replied to my email, it was the first day that she's been able to sit up for a little bit.) All in all, she said she's hanging in there and getting a little better each day.
She also wanted me to pass her love along, tell everyone hello and that she misses you all!
::hugs all around::
Kell