She is a recent darksider and the dark side corruption didn't take hold just yet. And the most attractive darksiders are moderate darksiders. Yuthura is a hottie for a darksided TwiLek.
Outside of Malak, Revan and Jorak, Major dark side corruption is rare, virtually nonexistant. Also With Revan and his dark sided corruption, it is either the people are scary ****less to comment or purely symbolic.