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It is never too early to begin training as you can see from what you've done with her at home and if you will be out of town, why not have her somewhere where she will get some training time in also and make the most of your time apart?
If her vaccines are up to date and she meets the requirements that the training facility as set forth (regarding vaccinations, deworming, flea prevention, etc) then I see no reason not to take advantage of your absence and get her into a program at the same time. You can tell the facility what you would like her to work on and they can do it for you while you are gone. While she is there she will likely also get socialization and play time with other dogs which is only going to benefit her in the long run. Given the work schedule of your friends, she will likely get more run around and interactive time at a boarding/training facility set up in a doggie daycare situation.
Of course, there are risks to boarding and trading facilities (I think of kids in daycare) such as contagious diseases, fights, etc but a well run facility takes precautions to prevent these overall and in general the benefits of having her professionally trained and socialized with other dogs outweighs any risks.
Does this help to answer your questions today? If you need additional information or clarification, please feel free to let me know.
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Have you made a decision yet? Is there something I can help you with? Do you have additional concerns about your puppy that you would like to discuss?