I started the quest for Tilavi in the Oja Tavern.

-The problem occurs when I try to finish the quest by telling Tilavi that Fruntar has agreed to take her shift. If I even mention Fruntar's name, Tilavi restarts the quest for me, asking "What did he say? He wants something doesn't he?" and then sends me off to Hirren to get the apron.
I've tried giving Tilavi the receipt from Hirren, but she won't take it. I'm completely lost!