"Under blue moon, I saw you So soon you'll take me Up in your arms, too late to beg you Or cancel it, though I know it must be The killing time Unwillingly mine

Fate Up against your will Through the thick and thin He will wait until You give yourself to him

In starlit nights, I saw you So cruelly, you kissed me Your lips, a magic world Your sky, all hung with jewels The killing moon Will come too soon"

Your story and mother's last song made me think of the Killing Moon by Echo and the Bunnymen. One of my favorite songs. Was your mother's invisible visitor Death? Why would she want him to visit you? Hopefully it's something or someone whose visit will be less permanent. Terrifying either way.