Your question is one we see frequently here on Trulia......
Very often sellers feel the frustration of the market, and look to blame their agents for the home not selling.
You may very well be justified in your discontent, but....did you get a written marketing plan prior to listing? Did you list at the price the agent suggested? Did you make any repairs or upgrades that might have been suggested?
Three months on the market and no offers may mean you are priced too high.
When I list a home, I tell the seller that we will be working as a team. I can make suggestions, but can't force a seller to follow my advice. This can lead to a lot of frustration all around.
What I think you need to do is sit down, in person, and have a real conversation with your agent......... review what she has done thus far (basic stuff like internet postings, brochures, virtual tour, broker open houses, public open houses, etc etc).......have her also update you on the current market conditions in your area...............what is new on the market, what has sold or gone under contract......what price reductions have taken place since you listed?? All of this is vital information for you to have.
Once you get a full picture of what is currently happening, and what has been done on your behalf, you can then decide how you want to proceed.
if you are still as unhappy, then speak to her broker or manager.....make sure your expectations are realistic. The broker can assign a new agent if that is what is in your best interest.
Good luck to you...............and the very best wishes
Prudential NJ Properties