Ah, I see your confusion. Advocating for the dismissal of her opinion on grounds of her profession is not a slight on her character. I’m sure she’s a very nice girl and a talented musician.

You see, ad hominem is an attack on someone’s character to distract from the lack of merit in one’s argument. I never slighted her as a person, ergo no ad hominem.

Now if I said she was stupid or ugly or talentless, therefore no one should listen to her, that would constitute an attack on her.

I hope this clears things up.