I suppose Roxy is meant to be sassy and precocious, but she just comes off as being bratty and in need of a lot of time out in her room. She repeatedly mouths off to adults, breaks laws, and never obeys any rules her mother does try to set. She's rude and inconsiderate to her family members. Not at all a good role model.
The movie is watchable. The actress playing Roxy is cute as a button. Some of the sets are very good. The mansion Roxy lives in is fascinating, although you do have to wonder how her mother can afford it on a bank teller's salary. There is also a gorgeous library, which is unfortunately run by a very stereotypical nerdy librarian. A lot of the characters are one dimensional stereotypes--the crabby bank lady, for instance. Small town life is depicted like something out of the 1950s. Neither the bank or the library has computers.
The plot is rather thin and doesn't really add up. Roxy's great detective skills are just coincidences and wild guesses that always just happen to be right.
I'd pass on this one. It isn't wretched, but with Roxy's behavior problems, why bother with a so-so plot.