That is quite the play by play story, you are good.
She sure is a sweet sweet little darlin, when I spoke with you today I told you that Kosmo would most likely get a tad upset.
It is all normal, remember this is all new to him and he is thinking to himself okay now when is she leaving. He will come around just give him sometime, Dudley had his nose out of joint for almost 4 weeks before I would truly say that him and Darby bonded the way I wanted them too.
Now they are best buddies, it will happen.
She sure is a little darling, glad everything went great at the Vet's and her knees are fine. Bet you are relieved, did you like the Vet. ??????
It is most likely going to take you till the wkd, hope you get some sleep.
I love the name Cookie too, or Kookie.
Get prepared for that spunky Solid Colour Personality, it is wonderful.
I wouldn't change a thing about Darby or his personality.