This demo tape is from 1991 and the sound is too professional sounding for a demo tape.
As far as I know the only official release that she did was a 5-song EP from 1998 called "Halfway, Through the Night" and a song called "The River Runs" that she released in 2017.
You can hear the EP and the single here. I see no evidence of this demo tape anywhere online. None of the songs from this tape are on the other releases except for the song "Black Dove" which was re-recorded.
She's not only a musician but she's also a writer.
She made a trailer for her book:
Check out her OFFICIAL SITE (which doesn't mention this demo tape at all).
(Don't call the number on the tape. It's from 1991. You know damn well this isn't her number anymore.)
1 The Sapphire's Time
2 Black Dove
3 Without Love