I Imagine them stepping on her dancing partner's toes(provided that there's someone brave enough to ask them to dance) and blaming them for being too clumsy...On second thought I'd love to see Cassandra at an Orlesian ball!
maybe thats PC's first encounter with Cassandra
She will just stand there making divine's bodyguard in civil clothes or something lighter than metal plates
and inquisitor will ask her for dance and divine will aprove it
And then templar/mage heretic(depends on your previous decisions) will appear and kill divine and Cassandra will promise to kill him/her for what he/she has done.