That frame doesn't actually look long enough for her in my opinion
Note though that the bars are barely further forward than the steerer - she must have a very short stem on there and that will be why her hands are so far back from the axle centre. Her proud father said she won a national championship in her age group on that bike, so her posture can't have been holding her back all that much.
Speaking from my own experience with building a bike for a similar height young rider, they are growing so fast at that age that dad is continually wanting to make the bike bigger, but my young rider was always resistant and wanted to keep the saddle a little lower and the stem a little shorter than I would have wished. And there may be something in their youhful wisdom - that short position does enable them to shift their weight about and get out of the saddle more easily, which can be a help when you're still short of sheer power.