Thanks for the kind words, and I'm glad you're enjoying the game!
To get Claire you need to have seen the first Lyx event in Act Three, and then conquered both the Apartments and the Bridge. Do the nighttime Bridge event (with the Chitterings) and then sleep. Claire should eventually appear :)
Viewing post in Corrupted Kingdoms (NSFW 18+) comments
I've done all of that and tried sleeping for literal weeks after and can't trigger it. I've literally captured every available area and have enough for every potion. Maybe it's a bug? (Update: just realized i didn't finish the emma event after checking the comments and now it triggered, all is well :) )