Now I'm beginning to fear that W is involving D in covering up her affair w/ OM "Jim." I don't have to like D having an affair w/ OM "Jim", but if she is going to enlist my D in lying to cover it up, that is severely wrong in my book and I hope the parenting evaluator believes the same thing too.
No matter how tempting it may be, don't get into the middle of that. There is no upside for you and consequently your daughter. If you bring it up the parenting evaluator without being asked, you look spiteful and controlling. My guess is that the parenting evaluator sees a lot of these situations and will know what questions to ask both your W and your D.