excuses for behavior

Hi This is my first time here,my girlfriend of 10 years (we are 60)I think she has found a way to lustify her behavior and to stop taking her meds. She has joined this "New Age- Metaphysical group that believes all in the world is right ,there is no and that you can create that in your own mind, and now her behavior is getting worse, she is cheating and lying, I am desperately trying to educate my self .Everything I say sets her off,she says "Idont need the adderral I can create my own reality.I am extremely frustrated and angry.I an going to see a counselor to try and learn what to do , any davice would be very welcome,

thanks  Norm