Count me in with those who feel that Junie B. Jones is Talking Trash when author Barbara Parks has her heroine (cheerfully) prattle ungrammatically. I understand that children do not speak in perfect English, and sometimes their errors are cute and amusing but frankly if such glitches are the fabric of your plot Parks has work to do as a writer. How will children ever learn the difference between good and bad grammar if they can't rely on books recommended by teachers and librarians? Not every parent can provide correction at home, and many children learn by reading as well as listening.
Normally I agree with the school of thought that feels any books beloved by children are worth supporting but I must make an exception here. While Ramona Quimby's malapropisms are charming: "Turn on the dawnzer's lee light," for example, this series leaves me cold! There are lots of other books with more likeable characters than the verging-on-obnoxious Junie, and I am sure booksellers (although perhaps not Random House, publisher of this series) and librarians can help these readers find something better!