At first I did not like Judy that much - she was way too talkative to my taste, and yet I slowly grew to like her, for her honesty and energy.
Still, the author asserts herself into teaching/preaching her own thoughts many times in Judy letters (perhaps all the time but sometimes too obviously) - all of those about Socialists and hatred towards elites and so. But it is not that overly done, so...
Still, a very cute, though highly improbable plot (sorry, can't tell, spoilers).