Well, as long as they seem well taken care of and healthy I dont think that is a "puppy mill" per se.. Maybe she has staff that help her raise all these dogs just go and see for yourself if you havnt already, although I gathered you have already been there, and ask about previous vaccinations, and if the puppies and adults look and act happy and healthy you should be fine
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and in the end, its not the years in your life that count but the life in your years.... Abraham Lincoln