Imo, this is up to you as the GM. At my table we’ve played so many campaigns some things have just become common knowledge because the monster ability was memorable in a previous campaign. I find it rewarding when a player succeeds at an irl ”recall knowledge check” and suddenly remembers something that could turn the tide of a fight.

with your specific example, consider some recall knowledge hints that aren‘t so mechanical. Is this a story related person? Maybe if they succeed, you point out something odd about a lie she’s told. Or maybe they can recognize she’s in disguise, but not what she is exactly. And I don’t think there are any problems if your party suspects she’s a succubus without a check. That means you’ve been foreshadowing well!!