If she knows Shadowheart / the player has the artefact (evidenced by the dialog after the entire scene) when speaking with Voss, why does she not immediately sell the party out? Considering she doesn't like anyone in the party, especially Shadowheart. It makes no sense why she would keep it a secret.
This would have been a good point of conflict between siding with Shadowheart or Lae'zel / Gith.
That whole scene doesn't make a ton of sense IMO.