Look at her side profile (a photo angle I don't see) and you should see a "U" shape between her neck and tail as the Langshan tail is carried very high.
She appears to have a higher set, but the angle doesn't show it well.
I'm not sure how to tell the difference between a blue Marans and a blue Langshan? I know the Langshans are supposed to be leggier, but I can't tell from the pics if that's the case here.