This is actually quite normal for some shelter cats.  She's been through a
lot - was given up by her owner and brought to a shelter with strangers there,
then to the pet shop with more strangers (obviously very scared there to go
into the wall), then to your house with yet again more strangers.  Quite
traumatic for a kitty.  It's going to take time but exactly how long I can't
say, maybe even a couple of weeks or more.  

Just make sure she's eating even if you have to put the food with her under
the bed.  Only problem with that is that she won't come out of her hiding
spots as easily if she has food to eat but you want to make sure she's eating
every day to avoid liver problems.  If you're using dry food, try some canned
to entice her; if she really likes it, it may bring her out of hiding in
order to eat it.  Put some on a dish and push it toward her; if she starts to
eat it, slowly pull the dish away from her; before you know it, she may be
out from under the bed to eat it.  You can also try something really tasty
such as salmon or tuna or some chicken.  

Once you get her out, it would be a good idea to confine her to one room for
a few days; having the whole run of the house is probably very intimidating
to her and this may feel safer to her.  Then go in there and sit with her and
talk to her without petting her at first; once she gets used to that, then
start petting her a bit.  You may want to give her something she can go into
in there in case she feels scared such as a large paper bag, an upside down
box with a door cut into it or a cat house; this would provide a feeling of
security until she feels ready to come out of her shell.  Just have a lot of
patience.  She sounds like she's going to be a wonderful companian once she
gets used to both of you (I love calicos!).

NanCe

(Hope the pet shop is going to fix that hole so no more kitties go in there!)

Give her time and do not rush herr.  My first furbaby took almost 4 weeks before she
really got used to her new surrounding and started slowly coming out.

Mine did the same thing.  I got her from a pet shop and she spent the car
ride home clinging to me with her head under my arm.  Thank God someone else
was driving.  Then she was under my couch for a few days, only coming out
when I'd been sitting still watching tv for a while.  But, since I teach and
that was summer time, she got used to me quickly.  Don't rush.  She'll be
much better if you let her feel safe on her own.  You could try going
somewhere that's not so big, like if she's under the bed, close the door and
try coaxing her our and if she comes out, stay in there for a while.  Let
her roam if she wants, but as strange as it sounds, my cat actually went to
the only place in my apartment that's remotely like a cage.  I  had a small
breakfast nook table that had bars on the sides and she would go sit in
there after she came out from under the couch.  I think it was comforting
for a while :)  Just give her time.

Beth

Everything is fine. Please understand that she has been through
frightening experiences. May be abandoned, maybe be without food,
locked in a cage, surrounded by noise and strangers, never knew what
will happen to her. She still doesn't know. Take care of her basic
needs, allow her all the privacy she wants, just be around and
available, and she will start coming as she begins to trust you.

Make sure she eats something everyday. If she will eat when offered
food, try to put her on canned food, it is better for her health and
you also won't have to worry if she drank enough water. If she is a
difficult eater, then leave dry food and water in a few places around
the house

How long it will take her to feel comfortable with both of you? Maybe a
few weeks, but give her as long as she needs.

By the way, she seems like a very cute cat. Congratulations.

Sounds like you are getting some great advice.  One thing I might add, she
was probably taken from her mother very young, maybe even as young as five
weeks - thats usually what has happened with pet store cats, and thats why
she does the sucking thing.  I had a cat that did this too - and the
behaivor continued off and on through his whole life.

Congrats on your new furbaby, and good luck to you.

Foxfire

Just give her lots of time.   Eventually she'll warm up to you and your
husband,  Some cats are just very skiddish.   Unfortunetly you never
know
what happened to them in their early years.

Just don't force it right now.   Eventually she will warm up to you and
come to you for attention/love.

You've had her checked out by a vet?   I always have any new cats
checked
out by a vet before they get near my other cats.