I'm pretty sure I've done all the elements of Trudy's quest.
I started it (Dark Knight in Mossy Expanse w Trudy)
I've done the Warlock (Alma) part.  I've re-met the Dark Knight in Waking Lands w Trudy.  I've found the Ghost Manor and had Trudy climb up.  And I finally backtracked to where I'd deliberately skipped around the Jester and did the game of Tag.

But if I talk to Trudy in camp about "a particular topic" I get "Seems there are no new developments just yet."

Is this a bug?  Does it matter that I already have QuickCast and Deep Focus the ordinary way (spending soul crystals for them)?
 

Ok, never mind.  I needed to have Trudy take it from a Werewolf too, but that's not listed as a requirement in the wiki here https://androgyny.miraheze.org/wiki/Questlines

Minor bug:  Any time you "gain" a skill you already have, either it should just skip saying you gained it (like I've gained "Pet" over a dozen times), or in special cases it should say something else (like in this case, "Trudy teaches you X, but you already knew that!")

Suggestion:  For the Trudy quest, maybe there should be a consolation prize, like more XP, or better, some sort of improvement in the skill, making it better than the skill you already learned.  Like QuickCast could cost less mana, or Deep Focus could gain more.