Disgusting attitude to take considering she is concerned with someones safety.
The damage to the helmet is light, as you say it is based around the plastic fairing, not the actual helmet construction itself.
HOWEVER any and EVERY drop of a helmet is to be taken seriously, as has been mentioned, the structural integrity may have been compromised. They are great helmets, I was looking at purchasing one for my bike not too long ago. Great reviews etc. However, after a 40cm drop, to cause damage like that, Id be weary.
GLWS as someone will inevitably get themselves a great helmet, but PLEASE go get it checked before selling