we haven't seen gameplay of kh3 music yet. maybe she is used for the kh3 music. kh3 is the last music story mom will recap. maybe her party will be kh3 sora and kh3 riku. like how we see days group doing days music, and bbs group doing bbs music, and ddd group doing ddd music. the classic team sora, donald and goofy u can just use the, for all music but maybe for other groups u can use them for their corresponding game music. idk if we can like have days trio in bbs music or bbs trio doing ddd music. who knows.