KitKat definitely was a slow developer. She wasn't lacking anything, just took her a little longer to figure some things out. It was pointed out to me she might be better off matched with another kitten about the same age. Of course my first reaction was no, I am very fond of this sweet little kitten. But over the next day or so, I realized that was a selfish attitude and I really needed to do what was best for her.
So, today I was tested on that. Another volunteer was willing to take her and mix her with the two "singletons" he already had. He has been fostering a long time and very experienced. I liked him, and more important could tell he would be a great foster for little Kitkat. I miss her, but feel good that I did the right thing.
Looking forward to my next kittens to foster, it seems a little quiet without a kitten meowing at me even if I have two of my small dogs in my lap as I write this :)