She will need to have those baby teeth out and no better time for that than when she is being spayed. Make sure you are comfortable with your vet though. I think some vets are not as experienced with the little guy's as they are with the big ones.
There are many more risks breeding her at her size than there are spaying her. Besides the stud fee you have x-ray, check-ups, tail docking, shots worming, food, and many other things when there is a litter. I only had two with this past litter and they have already cost me $600. Raising a good healthy litter is not cheap.
You also need to make sure that your little one is breed quality, no luxating patellas, bile test, a good pedigree. Good luck in your choice.
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