Don't speak like that of your young cousin where he can't hear it. [Aka where he can't punch you for it.

She considers him for a moment.] You will, eventually. And be the most dashing young dwarf, and turn the heads of all other dwarves your age. [She picks up what is not needed for dinner and starts to put it away.] You and Fíli will be a walking hazard to everyone's concentration. [She's obviously not speaking of things that will happen in Middle Earth - maybe of things that will happen in the halls, maybe of things that might have happened or that she always thought would happen one day.]