So I'm trying to get Celandine to follow me, and she's not, but I noticed the game was "thinking..." after her reply for a long time and I know that usually means it's doing a NPC action, yet I did not see any results, besides the relationship increase. So I checked the NPC Memories to be sure, and:
Apparently she tried, but it seems NPC actions aren't making it through to game play. I see she thought she did something, but I do not see the follow request in the dialog options or a meeting scheduled.