Is A Fork Really A "Deadly Weapon"?

Reading THIS story about a 44 year-old woman who was arrested yesterday in Indio, California for allegedly stabbing her boyfriend in the finger with a fork, I was surprised to read that she had been charged with "assault with a deadly weapon." 

A 'deadly weapon' is legally defined as a firearm or anything else that can be used to cause death or inflict serious physical injury.  Can a fork be used to kill?  (I don't think so.) And outside of poking a fork in someone's eye (literally), could a fork otherwise be used to inflict serious physical injury?  On someone's finger?

I also noted that this alleged fork attack occurred outside a convenience store, leaving me to wonder whether the fork was plastic, or even a 'spork.'