You have completed Grendel With Care given by Wulfric Foesbane in Mirkholm Keep. You need to now speak to Herkir in Mirkholm Keep to get the quest "Good Eats".
How does she even know what quests he has done and what quests he needs to do? xD Lol I'm pretty sure that all administrators can search up your wizard and know what has happened to you in the game. They hve information about you on the Wizard101 game so I'm pretty sure that they know how he has a full backpack. Anyways It's quite strange how you don't have a quest in GH. you prob need to look around. That's how i find my quests... Sometimes ._. .....