A sister has snitched on me.
I guess it depends what she is saying. That you have doubts? Or, that you're saying "apostate" things? Then Balaamsass gave good suggestions:
Smile, chuckle, and say: I think she/he misheard me. They are confused. etc.
If you want to continue on PIMO, then it's better to smile and deny than to avoid. IMO