When a girl wakes up with a beard on her first day at a new school she has to think of ways of hiding it from everyone but things get more complicated when she develops a crush.

I was going to say, yeah, I can't see how this is more than a one- or two-gag film.

She might also consider shaving it off...

Or else, reveal in the logline why she would not do this. You can work this in the 'character flaw': "When a girl with a phobia of sharp tools wakes up with a beard..."

It is worth mentioning this is a short film, so the reader doesn't expect a full feature to be milked from this (otherwise promising) concept.