Ask your agent how the house was uploaded to Trulia. If it comes through from the broker through IDX - only the broker can set it up to show or not show the address. If your agent uploaded it to Trulia herself or through a third party, she may be able to check a box that says don't show address - I'm not sure. My office's IDX opts to not show the address so therefore our listings do not have addresses on public websites.
ALL he/she needs to do is go into the MLS listing portal and hit the "address public" button and turn it on to "yes" and your address will appear on all listing portals. If he/she would like to discusssm I would be happy to advise.