I had the same problem. I never bought the comfort zone plugs-ins. I probably should have. I brought home a kitten last summer. Into a house that already had 4 cats. Crash my 5yr old adult did not like the kitten. She started growling and hissing at all the cats, or should I say screaming. Anyway the growling and hissing has finally stopped as of this week with the kitten. But now my mother's 2 cats(7 yr olds) attack Crash because she made so much noise for so many months.
Anyway my point is the cat that is afraid of the new one will probably eventually get used to the new one being there. It may not be a friendship but she will at least tolerate her.
Good luck.
Here is a picture of Crash

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Jaime owned by
Mya the dog
and the cats:Crash, Moxie, Gabby and sometimes Tucker

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