Nilla & Pumpkin are doing great!! We now let Nilla out of the room in the morning as soon as we get up and the two start playing immediately. Nilla has gotten to the point of pouncing/jumping on Pumpkin. A few days ago I caught them sleeping on the same chair, less that 5 inches apart...yay for kitten friends! :D
We still supervise them, & I don't let Pumpkin near Nilla if she's in a "vulnerable position" (eating/drinking, sleeping, using the litter box, when she's bathing herself).
Nilla's poop situation is getting better, there has been less accidents on the carpet & more & more in the box.
Both of them are now eating a mixture of Taste of the Wild cat food (an all stages life diet) & Wellness Kitten Formula (for kittens up to one year).
I couldn't be happier at the progress that we've made with both of them, as well as the lengths they have taken to getting to know each other. I'm one proud momma!