Can you cage her for a bit? Even having her caged will help the new ones get used to her. They can walk up to the cage, sniff and get used to her scent.

They will be hissing and growling for a little while. At elast a day or so. Depending on the cat, it might take a few weeks before they accept the new kitten. The last cat you adopted will take the newcomer the worst, and the first cat you ever had should accept the new comer best.

Let them interact naturally and let them work things out. Be there to "referee" but don't step in unless it get mean (claws out, biting, etc.) Swatting, etc will happen, but so long as claws are retracted, they are just testing the new cat. They will wrestle and play hard... again it had purpose... they need to establish her pecking order among the existing cats.