Thank you Weana, Viola and sir82. It all comes down to individual human nature, which is difficult to read if you don't know the players well.
You read the situation correctly, MS. Your advice appears to be sound but I have distanced myself from Watchtower society so would not know how or where to begin. The thought of engaging the Watchtower hierarchy in this conversation, however, is not appealing. (Is it a coincidence that your initials are MS?)
As a bit of an update we had a conversation about the shunning issue last night. It didn't go especially well, mainly because I have difficulty remaining impassionate about things I'm passionate about - see InterestedOne's contribution. I'm not very good at this, never have been. Her defenses went up, nothing got through and today it is as if the conversation never happened. No heat, no chill, just business as usual. Like water off a duck's back. Her mind is inpenetrable.