The Stopped Clock

There is a clock in my living room, made by my brother, which no longer works.  My 11-yr-old viola student noticed this morning.

Girl: Um... is that? ... does that.. is that clock right?
Me: Well, twice a day.
Girl: What? Oh.  You should get it fixed.  It's really nice. 
Me: Yeah, my brother made it.  The mechanism needs repairing.
Girl: You should give it to him for Christmas.
Me: Oh that's really nice.  Here's something that's ... actually yours anyway...
Girl: Yeah, it totally works, and you didn't make it.  That's what I'd do to my sister.
Me: Isn't she little though?  Your poor sister.
Girl [with that serious tone suggesting a History]: She'll live.