You the option of two words. Either "Yes" or "No". You don't need to add anything to those statements.
You know she's lying and she thinks you don't know! What type of message is that sending? To me it sends a form of acceptance. Have you accepted her relationship with the OM?
If not you owe it to her and yourself to inform her of such!
M:37 W:37 T:11 M:10 S17, S13, S10, S4 BD:06/28/17 OM confirmed 07/20/17 Recon the M 10/29/17 Working hard:2gether
Onward and forward
This process is not a sprint it's a marathon! Patience, Patience, Patience.