Theres only one true God(Jehovah) One Lord. One Bible. One faith. One Babtism. Eph.4: 5.
She missed the thing about "One Hope" or "Calling"! Do the JW's believe and teach only one hope to go along with that 1 baptism and 1 God?
4
One body there is, and one spirit, even as YOU were called in the one hope to which YOU were called; 5 one Lord, one faith, one baptism; 6 one God
You might want to throw out the question regarding mediator as well since she brought up the 1 Lord etc.
(1 Timothy 2:5) 5 For there is one God, and one mediator between God and men, a man, Christ Jesus,. . .
Ask her if she has "made sure" that the Watchtower teaches that, and what she believes.
Many dubs are not aware of this subtle teaching and are entirely shocked to learn the WT disagrees with Paul!
Try that!
Blondie is right, no matter what you do, be patient and kind. At least your mom is willing to talk. If you stick to what you can prove to her from the bible that she believes, you have a chance to open her eyes.
Frank75