She cannot be German, because her pronounciation of the Ach! is completely false
I believe that Ursula is actually half-German, half-Swiss, which explains her slightly strange accent!
Even my Swiss friends wouln't agree with that asch! instead of "ach", although this strange accent is very nice or pleasant, I wonder where Ursula has caught it. So Freddie has rightly mentioned that. Excuse my bad English please, I'm here for learning.
Perhaps Ursula has been living in the United States for too long ans has forgotten how to speak real German?!