Advise me on a build for my daughter

[LRRPF52]

I wouldn't put a brake on a hunting rifle, especially for a youth. The .260 Rem also has some recoil to it in a lightweight gun, but can be mitigated like Adamjp mentioned with the lighter projectiles.

I'm also a fan of the .284 Winchester-one of the most overlooked cartridges that offers a lot of performance from a short action, that is also relatively easy to shoot being a 7mm.

You could also do a 6.5x47 Lapua, and easily make reduced recoil loads with that without having too little case fill.