Those are my thoughts as well, they're probably just cooking something and will address her properly eventually since Larian themselves are now okay with her no longer being exclusive to only her path. Sucks that she's not as fleshed out as the rest and for so long, but she isn't the only one either.
Larian simply rushed the release as the game is still being treated as an Early Access since lots of stuff is still being put in, optimized, completely changed or reworked. Karlach for example is very bare bones for an Origin companion, is missing some several comments about Dark Urge moments and she ain't even on any of the promotional arts, not even on the in-game loading screen
Personally though I'm quite happy to see them cooking up new stuff for the game, every update feels quite fresh and fun to explore ^^
