Pretty much. She's like Marshal in that it can turn to a smile with an expression, but then it's back to the frown. Her upturned eyes make it look like she's constantly annoyed, but where Marshal annoys the $&@% out of me, I find it cute with Ankha.
Yes. Ankha's mouth always is like "^". It actually surprised me at first, and is the only thing that really bothers me about her, but the more time I spend with her, the more I find it suits her. If you need to visit her to see her in action, she's in Ferelden.
I have both Ankha and Diana in my town and while Diana is very close to my heart and my absolute favourite villager, Ankha is incredibly unique and rare and I wouldn't pass up an opportunity to adopt her. They're both lovely, in my opinion. The Snooties are my favourite personality type.