Did she actually swab the ears, make a slide, & check for mites under the microscope? If not, shame on her. If so, did he/she make a slide & also check for yeast and/or bacteria? If not, double shame.
Unfortunately, some vets will just "diagnose" ear problems without actually doing their job & looking under a microscope for mites, yeast, bacteria, etc. And unfortunately, all of these conditions require different types of medications to treat/clear up.
As far as inner ear hair goes, most short haired breeds don't have a problem with ear hair bothering them. Poodles are known for having extremely hairy inner ears (as are other small yippy breeds that have to be groomed often--shih tzus, pekinese, etc.). I'm not a fan of plucking ear hairs except in extreme cases because 1) most dogs don't really need it done & 2) the tiny tiny ear hairs actually serve to protect the inner ear.