Was Gabourey Sidibe in the movie The War as a kid?

Gabourey Sidibe was not in the movie "The War" as a child. The movie "The War" was released in 1994, and Gabourey Sidibe was born in 1983. She would have been eleven years old at the time, and it is not likely she would have been cast in such a role.

There may be a misunderstanding or you may be thinking of a different movie. Can you provide more information about the movie you are asking about?