Pro senior is the one to get for racing if she is big enough for it. Use a 12 inch front wheel for stability.
Adventures are lower tuned play bikes, if she's never ridden anything before they are ideal - pros are a bit fierce for learners. Adventures still ok for starting racing.
Suggest you go along to a local club meeting first, talk to some dads and get a feel for things. Often bikes for sale there too.
Oh, and get ready to learn all about centrifugal clutch maintenance...