This is most unusual.....one might assume something happened ie. illness, technology issues, change of offices/employment, loss of contact information, confusion about who was calling who, etc.
If you have the agent's contact information, it might be a nice thought to give her a call to let her know you are still on the planet waiting for her.
On the other hand, you would be justified to move on and explore other options with other agents.....if you choose.
The Eckelr Team