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Catnipped...give it some more time...We took Tux as a foster cat (we had
four other cats) from a no-kill shelter where he had been fostered in
someone's home for several weeks or a month or two. We did not adopt him
outright but took him in as a foster of our own on a trial basis. The woman
who had been fostering him told me that he had a lot of purrsonality, "maybe
too much" (to use her words) and that he could be a little wild with timid
cats, but that as long as my other cats weren't shy or timid, Tux would
probably be okay with them and that he was a loving lap cat who liked to be
picked up and purred a lot. Right.

Ho, ho...Tux was quite aggressive toward the other four cats (who are not
shy). He would take his revenge on me if I moved him from one location to
another and he didn't want to go;  he would leap on my leg and bite my
ankle. I had to use the water bottle a lot. He wasn't the least bit of a lap
cat and hated to be picked up. We kept on and on with him, hoping it would
get better. Things did improve, but very slowly. Finally, my husband said he
couldn't take it anymore and that Tux would have to be returned. So, I
phoned the woman who said she would try to locate another foster home for
Tux. She said she couldn't take him back to her house because she was
fostering a bunch of other cats, and the truth of the matter was that he had
terrorized her other cats. She said that during the time she was fostering
Tux, she had been on the verge of losing her job because she was so
exhausted at work from breaking up three to four cat fights per night
(involving him and other cats). To make a long story short, we all mutually
agreed that Tux needed to be an "only cat," and she asked if we could hang
onto him for just a little longer until she found an "only cat" foster
situation for him. We said okay. Several weeks later, she phoned and said
she had a placement for him. But it was too late...he had already calmed
down significantly, and he was ours!

The moral of the story is:  It probably took about six months, but this wild
and aggressive cat who needed an "only cat" situation is now a much calmer
cat and living successfully in a five-cat household. My theory is that since
he had been neutered just before we acquired him, his hormones took several
months to quiet down. Additionally, when the no-kill shelter originally
picked him up from animal control, he was skinny and full of fleas. He
probably had had a very rough time of it and just needed more time to
adjust.

For the first few months, we did have to keep Tux separated from the other
cats when we weren't home, and we also kept him separated from them during
the night. You have had Tayla a very short time, and she has really had a
very rough time of it. But since she is so sweet and you love her so much,
if I were in your shoes, I would get some Feliway and give it more time.
Remember, you always have the option of giving her back to the agency at any
time, even six months from now, so there's no rush. And BTW, don't feel
guilty about having to keep Tayla separated from the other cats for a while
longer. If she is aggressive toward your cats, she will be just as
aggressive (if not more so) toward the other cats in a foster home, and she
will end up being kept separated from the other cats anyway.
Good luck.
Best regards,
---Cindy S .