Crowd Control
It is all about maintaining some semblance of accord amongst all pax.Part of solving a problem is identifying it before it becomes a problem...it takes years of experience to do that.You cannot squeeze 20 years of experience into a young head.That is why it is necessary to have a mix of age and experience for a crew to function effectively.Give that young person a few more years of experience and I am sure she will deal with a similar problem differently.
An ambience in the Cabin is paramount particularly during long sectors.Pax need to feel that there is understated order on board or else chaos replaces it.