She returned from the dead to save her husband from lycanthropes...
...in her one and only appearance from Star-Studded Comics #1 (1945)
If this series continued, we probably would have learned more about Ghost Woman's abilities and limitations, and her husband John would come to the realization that she was serving as his "guardian angel".
Unfortunately, publisher Cambridge House published only one issue
each of three anthology titles featuring a number of
potentially-interesting series...and then went out of business.None of the strips packaged* by the Bernard Baily Studio were picked up by other publishers.
Personally, I'm surprised something similar to Ghost Woman hasn't come along since 1945!
Considering the ongoing popularity of both Buffy the Vampire Slayer and the Twilight Saga, a concept like Ghost Woman seems like a sure hit!
Trivia: Editor/art director Bernard Baily, was the co-creator (with writer Jerry [Superman] Siegel) of comics' most famous ghostly avenger, DC's The Spectre, who wore a similar hood to Ghost Woman!
Unlike Ghost Woman, The Spectre continues to fight evil from beyond the grave, even appearing recently in a direct-to-video anime, voiced by Gary Cole...