I like the idea about she just wants to attend another most supportive congregation. Done all the time here in states.
I would not answer their calls nor open the door so they showed up to my place of work, and waited until I was headed to my car to tell me they had scheduled a Judicial Committee for apostasy. I very plainly told them not to show up at my place of work for me.
They told me the JC was scheduled and if I didn't appear they would proceed without me.
So first thing I did was write an email to the COBE in the congregation and told him that I was withdrawing membership from that congregation. Legally you can cancel your membership in any organization religious or not (except the mob, maybe, no legality there).
Next I wrote a letter.
I told them in the PDF letter I attached to an email that I sent to all the BOE's email addresses that I felt some of them were harassing me and I did not consider myself any longer a member of that congregation so if they continued their harassment I would seek legal means to stop what I considered abuse and retaliatory behavior.
I told them I was withdrawing membership in that particular congregation but this in NO way meant I was disassociating myself and reserved the right to seek another congregation more welcoming than they were.
It's been over a year now that I haven't sought to join another congregation and I like it that way, once in a while I listen in on the phone to the meetings, and I've gone to assemblies and the Memorial, but I'm liking my fade and taking it slowly for my wife's sake, it's been traumatic for her, she's still quite loyal to the WT.
The JC was never held. And I'm sure they checked with Momma WT's legal department who most likely told them to stop it and they were on their own if they persisted and it became a legal matter.
You've got to hit them hard or they'll feel free and mighty to continue the mental and emotional abuse. I say knee them in their congregational gonads! They'll get the message to leave you alone.