If you are doing LRT you should NOT be taking her calls... She cheats on you and expects you to be there when she wants to talk?
Ignore the call...
The idea is for YOU to act publically supportive of your marriage by exposing her affair and encouraging everyone to support the rebuilding of the marriage including your wife... Other than that do NOT engage her... If she catches you, use the SAME SCRIPT EACH TIME.. the confrontation script as you always do... stop cheating, rebuild the marriage, you are hurting everyone, etc..
EACH time she confronts YOU, you say that and EXIT the convo...
IGNORE her phone calls.. she's baiting you and manipulating you and your marriage into the toilet... time to go on the offensive Bunker