If you mean "Some of her grades have improved", say that. You will sometimes hear 'some' used to mean "a bit". "He's grown some since I saw him last." I believe this occurs in some AmE dialects. Even so, it's wrong in the original.
"He's grown some" is correct and natural in AmE, but to me it is it also rustic and antiquated. It is like the dialogue of a cowboy movie, not something anybody would say today.
"He's grown some" is correct and natural in AmE, but to me it is it also rustic and antiquated. It is like the dialogue of a cowboy movie, not something anybody would say today.