You mean—to follow through with the fairytale analogy—a third-party intervention? like a fairy god-mother?But the second husband is involved personally and has interest in the wife (he does, right?), so he cannot be an appropriate person to help.
But on the aside, and during the courtship with her future second husband prior to their marriage, the spell must have been temporarily repressed, for during a lucid moment of independence and free-will, she reached out for continuance with a future husband, for a new life, with a new hope.
The macabre relationship of being "possessed" beyond the grave. Is it immoral? I suspect that many elderly who have recently lost their mates experience similar communions with their lost loves but are complacent and silent about it.