Well if she is not, than the whole brief hospital scene when those other kids left and she watched them out the window with their parents is pointless, it is implied that there is a twist to come. Her name is Sumire. We are serious about that, her being Nakato and Konan's daughter, that is a long shot.
I know what her name is, but I find it odd that they never call her by her name, lol.
I guess there is something to come... but I would find it hard to believe that she is some sort of ''evil'', unless she is on a undercover mission. They'll have to do a good job at explaining it all, tho... Hopefully they do so, cause I do agree that these type of scenes would be pointless if nothing.