Thanks for all the comments - I will follow through, and to clarify, I did ask for her name and got it from the head flight attendant. I feel silly that I forgot to ask for her name when it all happened originally (I was flustered, this upgrade stuff is relatively new to me), but the head flight attendant explained to me how it was not usually like this and that the helpful attendant (Annette) had brought my seat situation to her attention.

I have both of their names, so hopefully this is enough to track down and get to the right place! Honestly, this is the first time I've ever felt that someone has really given great service / handled a rocky situation well in the past 4 years of frequent flying. It's sad though that something negative had to happen first in order to recognize something positive. If it hadn't been for Annette, this entire story would had been instead been an angry rant post (except it did have a happy ending, so, I wouldn't have been justified in whining).