I think if i were you i would be counting my blessings! lol...
I have three, two bark... and bark... and bark...........and so it goes.
The other one wont speak a word. i guess she figures the jobs being taken care of.
They are all adults.
Roxy barks at anything... sometimes i believe she doesn't even have a clue what she's barking for. I tell her no and she usually stops. I'm waiting till the day that i have to start the pennys in a can thing.
I don't have any tips for getting her to bark because i just wish my other two didn't...

but i guess if you wanted to get her to bark to go out... have a treat on hand and when ever she barks for some reason say bark bark good girl.. and give her the treat. Go from there.
Also i used the bell on the door trick it works... they ring it... but usually my girls pace to go out no barking... they give a subtle wine and pace to me and then back to the door until i let them out!
Best of luck! and welcome!
post pics of your baby sometime!
Take care