The bug is/was a bodyshop problem - if you don't have Pets, then creators who DO have Pets' creations will not show up in your game.
I don't actually have it installed, or any of the expansions for the matter: I got rid of them all after I decided to start over and I'm now pretty happy with just the base game.
I've heard about the Pets issue, but the weird situation here is the Loveless skintone is the only CC by Enayla my game refuses to acknowledge. All her recent content shows up without trouble, including the large eye collection uploaded here this last week.
Stranger still: when installing Annika I actually got her to show amid my other Saved Sims, and her skintone did appear on her perfectly, only my Bodyshop and CAS both just refuse to list it among all the other available skintones I have. Curious about this, I installed Incubi to make a test, and both CAS and Bodyshop listed it at once, while still rejecting Loveless. So who knows. Perhaps this is simply a weird personal game issue.
Enayla and all, thank you for bothering with my weird case. Loveless is rather close to Fall, so I guess I'll just make do with that.
Even the eyebrow makeup fits that skintone rather nicely.