I'm with Job here, Heather, don't sweat it. I will bet that the editor you are friendly with is so happy that he has you around to help keep Mr. Perfection in his place! I know it's hard when you hear someone say anything "negative" at all when you are in a new job but it sounds like the positives out paced the negatives by a large margin.
Your self esteem took a hit when Smokey bombed you. I can relate to that in a big way. Just be aware of this and remind yourself that for a while at least, you will be sensitive to any apparent criticism. Know that it will hit you hard at first but remember it's up to you how you react to your emotions. In time you will start to have less and less reaction until you are able to no longer let it affect you. Until then know that you are probably over reacting.
As for D12, she will take time to adjust. It wasn't your idea to upend her life, that's on Smokey. You are doing such a great job making the best of a bad sitch that she would be going through whether you moved or not. Her old life, like yours and D20's ended the day their father walked out. You couldn't stop that. All you can do is try and make their new life the very best it can be and IMO are doing a great job so far! Breathe Heather, you got this and you will do great!