@akis883
From my experience with my son, who is now 15 and has been national champion in my country (Poland), I would recommend not to over invest in children bikes. Of course buying a very good bike, will give your daugher an edge over other children. Lightest and stiffest bike, preferably carbon, with light racing wheels wiill improve her results. But in the long run, IMO, better development strategy for young cyclist is to buy better bikes, once children achieve certain level. It is also not good psychologically if they win nearly every race they attend. In our club, we had parents over investing, and had children at age 8 or 10 on sub 9kg, carbon bikes and SRAM Eagle components. They were winning most of the races. Now, after few years, nearly none of them, races anymore. They were winning mostly because of equipment advantage and not because of better skills or endurance. Once their opponents started to win against them, they lost their motivation and quit. Also 29 inch wheel doesn't develop proper technique. It is better to start with 26 or 27,5 inch wheel. My son started with used 15kg alu bike with 26 inch wheels, moved to another used, 12kg one with 27,5 inch wheels, and only once he reached 175 cm, moved to 29 inch wheels.
Technically speaking I would choose Specialized overy Cube any day. Better warranty, better after sales service, better geometry and potential to get race ready with light racing wheels and few changes.