If they tell her they were ONLY involved so they could use the Library, show her this article.
Disfellowshiping—How to View It
Watchtower 1981 Sept 15 p.20-26
14 One who has been a true Christian might renounce the way of the truth, stating that he no longer considers himself to be one of Jehovah's Witnesses or wants to be known as one. When this rare event occurs, the person is renouncing his standing as a Christian, deliberately disassociating himself from the congregation. The apostle John wrote: "They went out from us, but they were not of our sort; for if they had been of our sort, they would have remained with us."—1 John 2:19.
15 Or, a person might renounce his place in the Christian congregation by his actions, such as by becoming part of an organization whose objective is contrary to the Bible, and, hence, is under judgment by Jehovah God. (Compare Revelation 19:17-21; Isaiah 2:4.) So if one who was a Christian chose to join those who are disapproved of God, it would be fitting for the congregation to acknowledge by a brief announcement that he had disassociated himself and is no longer one of Jehovah's Witnesses.
16 Persons who make themselves "not of our sort" by deliberately rejecting the faith and beliefs of Jehovah's Witnesses should appropriately be viewed and treated as are those who have been disfellowshiped for wrongdoing.
Also remind her that the Organisation does not allow it's publishers a membership in the YMCA....even though they only want to be members to "use the gym". Same exact difference...only THEY are more reprehesible since they are the slave "looking after" all of Jesus earthly belongings.
Good Luck....and congradulations! You planted a seed!!