She has rough skin on the ears...like a shark.

More like she's a CatFish (get it).
Catfishes are known to have razor-sharp, serrated fin bones that usually be used in self-defense by delivering cuts to whatever attacks them but also can be used to deliver toxins

While most causes 'just' stinging pain there are few species where that sting can cause death if not treated quickly.

akumaten said:

She has rough skin on the ears...like a shark.

But sharks are smooth!