Maybe she heard the recent official announcement that Armageddon will be here before 2040 and she wants to save your life?
Her motivation may be loving and concerned, but her worldview is wacko.
Ask if her belief in this date is so strong that she will sell all she has - yes, even all her shoes - and throw herself and her family headlong into the full-time misery? OK, they may call it "ministry" but WE know it for what it is, don't we?
Or will she follow the example of the Watchtower Governing Body and simply pay lipservice to this "new light" while carrying on like nothing was going to happen?
The GB is right - nothing is going to happen! They just like to keep people "tuned-up" and in line by spouting bilge every so often.
Fair warning - after her visit she will be angry at you for rejecting her message of doom.