the initial idea was to film everything with one girl in white and black (it was too complicated and we could not do some stuff so it changed :) ) so you are pretty close to it. Understanding the lyrics would give a bit different perspective but yes it is duality and kinda a inner struggle.
Lyrics are form an old poem, with mother saying to Anča to stay at home and not go to the dance. She will be fine at home. It escalates to a bit of a tragic event (not really explained why in the lyrics :) ). so it could be 2 scenarios. where she does not listen and goes, or the end scene where she decides to listen and stay home.