Oppo has pretty alright software experience, kinda on par with Vivo but not as good as let's say Huawei's EMUI. Price wise, of course Huawei and Mi A1 would be a better choice but since your sister insist on this model. It should be fine, but note that the screen resolution of Oppo F5 Youth is 2K in quality. The 3200mAh battery may not last as long.