You really can't stop her from running if she decides to. If you have snow
on the ground, I'd either supervise her closely, or don't let her out until
spring. My 4 yr old newly adopted cat flew out the door last week and hasn't
been seen since. One theory is that he's alive and well, but pissed off
because he can't smell his way home due to the snow that's fallen since he
left.

Yes.

When my kitten QT got run over in front of my eyes 5 yrs ago, I introduced
no going out free rule, but also going on a cat-harness and leash rule,
which proved to be excellent for cats, and some of my neighbours thinking
I'm mad :) I don't care what neighbours think, as my cats mean to me more
then anything, so yeah, went to pet shop, bought 5 cat-harnesses and 5 long
dog retractable leashes and Bob's your uncle. Cos I'm on ground floor They
go out through window and I hook them up so I  don't even have to supervise
all the time. They get their 6 meter lil run of the garden and are more then
happy and so am I. Its a safe option.

Your kitten will of course NOT like the harness and will whinge about it
like they do about the collars first time you put it on them, but I did it
cold turkey like with a cat collar: Put the harness on, loosely, and just
leave it on until the cat is considering it part of her everyday thing. Then
start walking her like a lil dog outside and introduce her to the area, cos
at the end of the day,she may be a clever girl,and might wiggle out of it
one day :) Do this in any case even if you decide later to let her out
harness free.

Make sure you get a cat,and not a rabbit harness. They are different.Cat one
should contain 3 straps and they come in different sizes, so you may need to
get her bigger one when grown. Pets at home in UK do wonderful ones, in
various colours and lengths.

Finally although this sounds like a quality time spent together, do not
expect her to walk on a leash like a dog, cos cats rebel to any pulls.
really, let her sniff around and enjoy outdoors safely, but for any
exercise, you will need a dog :)

Do not get nylon ones that are round and thin like a rope, they can be
dangerous and can hurt/cut them, nor this shape:
http://www.morrco.com/fig8cathar.html. Its always better to have the pulling
point on the back then neck.You don't wanna strangle your cat when you pull.

Get the thicker, flat ones,in letter H form,  preferably not nylon ones

These are kind of OK for a short term use
http://www.morrco.com/hstylcathar.html but again its nylon so inflexible

These are what you want:
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=2966&Bc=1&N=2002+113520

http://www.drugstore.com/products/prod.asp?pid=94036&catid=71747&trx=PLST-0-CAT&
trxp1=71747&trxp2=94036&trxp3=1&trxp4=0&btrx=BUY-PLST-0-CAT

and

http://www.ultimateanimals.co.uk/acatalog/cat_collars_cat_leads_cat_harness_cat_
ID_tags.html
Reflective one

For the world of me I cannot find the pic of the ones that I am using.
Basically it looks like a rope, but its flat and about 1cm wide, very strong
but a tad more flexible then http://www.morrco.com/hstylcathar.html . pets
at home in UK stores them,a nd lots of pet shops.

Make sore middle strap that connects head and back strap is long enough and
doesn't pull the head up.

http://cats.about.com/library/howto/htwalkleash.htm
for more details on how to train.

Best wishes

I'd begin by putting in a cat door. If possible, one that you can set to let
her come in but not go out. Then if she ever does get left outside and you
aren't there to let her in, she can come in the cat door. I'd leave plenty
of food just inside the cat door at all times. (There are cat doors that can
somehow be set not to let in other cats or raccoons etc.)

Well, actually, I'd begin by getting her a microchip ID, just in case. :)
And make her an elastic collar with my phone number on it.

My neighbor got a young cat who had not been outside. He built a cat door in
a window about 6 feet above ground, with a platform where she could sit and
look around. This let her get used to the outside world while feeling safe,
not likely to make a dash and get lost.

Gee's idea of a harness and leash might be good for a while too. Just watch
very carefully that she doesn't get tangled up; cats can get strangled.

And/or you could make a little cat run out of tall chicken wire, and/or a
little fenced area where dogs and other animals couldn't get in.

All these things would help her get familiar with the outdoor area, so she'd
be less likely to get upset and run too far. Once she's used to the place,
she could come and go freely. Even then, when you leave, I'd put her back in
the house and close the human door, so she doesn't follow you away. If you
want her outside while you're gone, she can use the cat door to come back
out.

Btw you might check with your vet about any extra vaccinations she might
need.

Margaret