» Fri Jun 01, 2012 12:43 am
http://www.uesp.net/wiki/Skyrim:Striking_the_Heart
This is the quest he's talking about. It looks like he's talking to the right person, and there's no item he could have accidentally dropped. The only thing I can suggest is to try talking to the other companions. If she thinks you're working for someone else, maybe you need to talk to them.
Also, try talking to Kodlak (the leader). The next quest should come from him.