Renka showed up as soon as I was in the right place, did a few quests and then it seemed to break part way, perhaps because I am backtracking for it? I triggered the empty town event and it said she was now in Henesys, which she isn't. the next thing in the quest tracker says find her in Pig Pasture but she isn't there either and I can't click on the Nautilus door as that has already been done. I tried poking around neighboring areas to see if the quest was actually elsewhere but just little dragon around.
I am unsure if there was a transition event somewhere that would be more obvious if doing the quest along with the normal game progression