don't even consider breeding her unless you do what's lited below!!!...

wait till she's 2-4yrs old.
genetic tests
vet check-up
shots up to date
register her
find a REPUTABLE breeder that has a nice male that contridicts your westie's faults.
show her in conformation, agility, obiediance, etc.
make sure you have homes for ALL the pups when they are ready to go to their new homes
take back the pups when
be ready to take back the pups if their homes don't work out.
have PLENTY of money stashed away for stuff for the pups such as shots, food, emergancy kit, vet care, etc

i've forgot some of it, but it takes A LOT to have a succesful, healthy litter.

oh, if you just have a cute little pet you want to breed....DON'T BREED HER!!!!!!!
if you still want to breed your "pet" go visit a humane society and just know that a lot of those puppies won't make it out of there alive just becase there are no homes for them....and if you breed you will be adding to this.

if you want cute pups running about your house become a foster parent to a animal shelter or rescue(even a westie rescue). you'll be litterally saving lives.