Looking for good recordings of female vocals I have not yet tried...

Many great suggestions.  Not mentioned:

Shirley Horn “Here’s To Life” - Gorgeous recording.  Arrangements by the great Johnny Mandel.

Abbey Lincoln “You Gotta Pay The Band” - Bonus: Stan Getz as guest soloist.

Phoebe Snow “Phoebe Snow”.  Fantastic record in a “folksy” vein.  Guest appearance by Zoot Sims.  Bonus: Great sounding, mostly acoustic, recording.

Elis Regina.  Probably the greatest Brazilian female vocalist of all time.  Anything by her is worthwhile,  

Netania Navrath “Chants d’Auvergne” (Canteloube).  Gorgeous music; gorgeous recording.  

Frog Records remastered the entire Bessie Smith catalogue. Back in the day I had the Columbia box set but was disenchanted with the sound quality. The Frog remasters are simply amazing by comparison.

If you like art music, I’ve heard good things about Mediaeval Baebes. I’m going to discover them myself.

https://www.mediaevalbaebes.com/

On the Striking It Rich album by Dan Hicks And His Hot Licks (produced by Tommy LiPuma---nominated for 33 Grammys, 5 of which he won, engineered by Bruce Botnick---best known for the Doors albums---at Sunset Sound in L.A.), Maryann price sings the classic "I’m An Old Cowhand" with a remarkably relaxed (and delicious lasciviousness that would make your grandma blush ;-) feel (like she’s had a few, and maybe a reefer), backed by a deeply-swinging small Jazz combo (upright bass, Gibson L-5 archtop guitar, snare drum played with brushes, fiddle). As a welcome bonus, excellent recorded sound quality, demo material.

Ernestine Anderson - Moonlight in Vermont 

Anita Baker - 

Change Moore w/ The Rippingtons

Lissie - Dreams

Dominique Fils-Amie, Three little words