Is she a former/current rider?
Hannah Walker was on the English feed, and I know from this thread that others weren't impressed by her during last year's Vuelta. I was mainly watching that aprt of the race without sound (not because of her involvement, but I was watching the final of the Danish football cup), so I can't really comment on her performance today.
No. As far as I can see she's an author (children's books), journalist and moderator. As far as I can see her qualification really isn't much better than mine. She does have a nice voice, like I said, although that constant laugh in her voice can sound a bit forced with time.
She keeps out of the real race stuff most of the time, but when she doesn't she doesn't sound like she knows much, and today, when the action started on the descent she asked "is now the time for some stories and myths or is it a bit... (unfitting)...?"
She's polite, but... ugh...
I would love to have a good female commentary voice there, but to have a woman just so that you also have a woman's voice there, and giving her the boulevard stuff, that's annoying.
Voigt and Aldag have become my favourite commentary couple though, they go lovely together. Voigt always totally enthusiastic, lively, brings anecdotes, animates the commentary, very emphatic and honest, but often talking bs in terms of facts and tactics, while Aldag is the most neutral commentator I have ever heard, no modulation in his voice, no enthusiasm when Mäder wins, no pain when Landa is out... but he's pretty precise, knows the stuff and offers facts and clear assessments.
And I love how he always corrects Voigt without letting it sound like he corrects him, like he just adds something.