Hey, Kerri,
Welcome to motherhood. I think every mom has those moments, regardless of how your children came to be a part of your family. I fondly call them my "stellar mommy moments" and I have lost count of them by now- my kids are 10, 8, and 6 1/2. I would not worry too much- I don't think that today's events will send your dd into therapy
Tomorrow will be better... and sooner or later, you will have another "mommy moment". We all do; so don't beat yourself up- just come back here to share!
Kelly