I am sure Sugar misses her original parents, but I am also sure she loves you too. I have a 16 year old boy myself, and I am trying to brace myself for the day he is gone too; it's just a heartbreaking thought. So try to do the very best you can with Sugar as I am doing, and know that you are giving her all the love you could possibly give as substitute parents. She is beautiful; you have done a great job with her.