Rescued Cat Problems

Six weeks ago we rescued a female cat that had been staying in our backyard for about a month. We called our neighbors in our small subdivision and did everything we could to find her owners to no avail. She was not long for this world as we have coyotes in our area.
We had her examined by our veterinarian and found that she is between one and two years old, spayed and in good health. She is a sweet cat and gets along very well with us.
Now to our dilemma. Our first problem is that she dearly misses the outdoors and walks around the house, mainly at night, howling and trying to find an open window or door to get out. How long will this go on and is there anything we can do to help her settle in to her new environment?
We are a multi-cat household and at first we seperated her from the others. We introduced her slowly to the other cats in a controlled environment. In the beginning she would hiss and growl as she would when confronted by other cats outdoors. Now she only hisses or growls if our cats come too close to her. She is getting more relaxed around them each day.
Our second problem is that one of our female cats has not accepted her into the household and will hunt and attack the new one every chance she gets. We do not understand our cats behavior towards this new kitty. What can we do to help these two get along better?
Sometimes we feel guilty for taking her in from the outdoors but we know that her life would have been cut short as many of our neighbors small pets have fallen prey to the foxes and coyotes that roam this area.

Kitty Kat in Georgia

the problem will be lesser with time as she will make friends with the others... But as now playing with them is no alternative...

a) try with Feliway/Felifriend.
b) you may try with rubbing the smells among the cats; rub the chins, around ears, back at the tail on one cat, then another...
c) make places for them all to withdraw. they will feel more unstressed, both the newcomer and perhaps even the chasing dominant one.
d) as you cant let her go outside, make possibilityies for her to do a lot inside. Some sort of climbing. Do make a climbing-tree of planks, perhaps even so it goes on to your books-shelfes (fasten the shelves to the walls of course).
e) a laser-pointer is a excellent toy. She being a stray not feral surely knows how to play... And if you get both her and the chaser to play together!

She definitely does sound like a stray or abandoned kitty and not a feral, so you're already way ahead.
You can also try rubbing a drop of pure vanilla extract (not imitation) on the base of the tail and under the chin. This makes them all smell alike, and is easier than trying to get them used to each others scent.
Another vote for Feliway- its on sale at Drs Foster and Smith right now.
Give them a little bit more timeand patience, and as Stefanz said, make sure all the cats have a place to retreat to, such as a carrier with the door removed, or some old empty cardboard boxes (like the 24-can packs of pop or beers).

Outdoor cats can and will become accustomed to being indoor, and they are all certainly safer that way, coyotes or not.

Yay for you rescuing this kitty!

Thanks for everyone's advice. We will certainly put it all to use.