I really think catmandu above is right - the resident cats need some time to show this newcomer that they were there first. Hissing and poofing is just going to happen! As long as you do not see any of the kitties acting vicious with her - I would just keep watch. I have brought very young cats into my house also and they were given the same treatment - but when I watched - I could see that the older ones knew they were babies and never hurt them. I did dee wrestling even, but they were gentle with them always. Now, my two babies have three doting family members Uncle Dylan, brother Eliot and sweet surrogate momma Emily!!

She is adorable and I hope you are enjoying all the cuddling as it sounds like this baby adores you so much!