I agree with sandi2 about confronting over the phone... No bueno... It does appear weak... But if you go NC, detach and get stronger, then confront her when she returns, that sounds like a plan... It will begin to all come together for her... It might make sense to her... "Oh! That's why he needed space... He knows I've been lying to him."
Sheesh, 44... Don't you remember her awful behavior at the movies? How disrespectful she was to you and your friends?