TD: JW's are legally organized in the U.S. as a congregational church, which means your relationship is with your congregation and only with your congregation.
Elders from a congregation you have not voluntarily affiliated yourself with do not have a legitimate claim to pastoral interest and/or ecclesiastical authority.
Personally, I think she should just threaten them with an attorney. Hire one to write a nasty letter threatening to take action against the elders personally who are bringing this up; it would be worth the money. After six months she is officially inactive.
BUT: What TD said previously (quoted above) ..... this might seem to be an unimportant point, but I think it's very significant. If all three elders asking the questions didn't know you from before, and/or you have moved, or congregations have changed, then the elders can't "counsel" and then DF you? And if you move, or move back after a period of time, and don't "re-affiliate" yourself with that congregation, there is no "bond" between you and them?
That would help a lot of people out if the elders can't even claim "pastoral interest" (much less "ecclesiastical authority") about you. The individual elders might not even understand this, but I bet the bOrg legal department back in New York does.