As regards the lack of general awareness of the LP's release in the late 80s , one should also keep in mind that Demon's output of soul music / black music was very limited compared to their pop / rock releases. They licensed and re-issued Al Green's Call Me LP around that time together with the Lamont Dozier LP a few years earlier but really not much else. Obviously Sandra Wright got lost in the shuffle.
For soul fans one could say that there were more immediately interesting releases on the related Edsel label at the time from Don Covay, Major Lance , Rufus Thomas, Sam and Dave.
Are the people who were behind Demon / Edsel still around ? If so perhaps you can use your industry contacts to get in touch with them to see if they can provide any more information on the Sandra Wright release?