She looked very challenged the last 2 weeks, probably because of the stress of having to learn 2 dances per week.
Both she and Jason were pretty unflappable when the judges barked at them, another reason for people to vote for them. Can you imagine how Shannon would've reacted? "Kristi, I didn't care for your routine!!!" "Jason, your routine was a turkey!!!" This show is usually filled with drama queens (and kings) and it's r e f r e s h i n g to see class acts.
I doubt Kristi is having trouble learning the choreography of 2 dances per week. She's been learning choreography her whole life. She should have an advantage over others when it comes to having to learn mutiple dances.
I think its more that figure skating technique translates better to some dances than others. It doesn't surprise me that Samba was a challenge for her. What surprises me is that quickstep was not more of a challenge.
Her skating style was always smooth and flowing rather than dynamic and bold. Horizontally even. She was not known for quick footwork or showy routines. Not alot of POW!
However, even though the footwork is fast on quickstep, the body is pretty still and steady which would fit with skating. Samba has more bounce, and all the latin dances have more isolation of various body areas moving independently (as opposed to the stillness of the upper body in Foxtrot, etc)
For all her beauty and grace on the ice, Kristi was not a dancer, and her skating style did not achive a wide range of variation. I say that even though she was one of my favorite skaters. She is also very shy, therefore seductive or uninhibited movement is more of a challenge for her than elegant smooth movement.
It also doesn't surprise me at all that she accepts the judges comments with class. She has been judged (very publically) for her performance efforts for decades. She is used to the judging process, whether it rewards her or seems unfair. Skaters need alot of composure to get their world level scores on international tv, knowing their whole future depends on those scores and that it is going to be, at some level, subjective judging.