Evelin is growing up. As with many preteens, she 'shuffled' her feet, i.e. did not pick them up, but dragged her shoes along noisily (as my son is doing at the moment!), and generally moved about with no self-consciousness about posture.
Her new 'sultry stroll' and 'swaying hips' are the results of the combination of maturing body and teen self-awareness.