Atris most likely knew about the Council's decision, she knew who Kreia was and that she was responsible for Revan's leanings. In the novel, Revan actually meets with Atris after the events in Kotor I and asks her about the Exile and Atris tells Revan what happened.
You should consult the Revenge of Revan team (N-DReW 25 is the most responsive) and make sure it's compatible with their planned expansion when it comes out.