I'd want someone that knew how to aggressively market the heck out of my home.
Interestingly enough, we've sold 5 homes over the years, and I've never had a listing agent also be the one to bring me the buyer. It's always been another agent with one time being another agent out of the same office.
Like another poster said upthread, anyone can sell what's on the MLS. Nothing is preventing her from selling that house and getting her share of the commission. If this agent is so aggressive and good at what she does, why didn't she bring a buyer(s) into that house?