Oh dear (((awaken)))...I know you had such hopes for your nieces. How frustrating...you've been such a great daughter/sister/aunt to everybody.
There is no reasoning with the cult mind. The cult mind when presented with issues about their beliefs or conduct will go into defense mode and defend the lies. Their natural mind's reaction would be to discuss an issue or fact as presented.
I'm so sorry you had to experience this. It is maddening...I know. This is the crappy cost of leaving. **sigh** I'm here for you. xx