Pardon my being nosy, but why are you wanting to breed her? What titles has she earned, if any, and in what areas? Has she had her hips, eyes, elbows and heart checked by the OFA or PennHip to ensure soundness and no genetic traits that will possibly be passed down? Has she been TT'd (Temperament Tested) or earned her Canine Good Citizen? What outstanding qualities does she possess that make her worthy of being bred?
I'm not trying to be rude, but just because she's a great pet, smart and obedient, and looks pretty, or all your friends say they want a pup off her, those are not sufficient enough reasons to breed and add to the already over-population surrounding these dogs. I'm sure others will chime in on this, and they might not be as nice. We're very aggressive when it comes to supporting/preserving the breed in any way possible, and often times it starts with deterring every day people from breeding their every day dogs.