Susan,
You might want to give yourself a little more credit when it comes to the part you played within the project. While it may seem that the big picture designer who is credited as the author of the project should receive the glory, I think you’ll agree that it takes a team to get the project actually built. Design doesn’t stop when SD/DD level is over and you move onto CDs. I bet you were responsible for hashing out some intricate details, or maybe you were involved in the discussion of materials or site furnishings. If you had a hand in producing the graphics and build documents on a regular basis, and more importantly collaborated with your senior and PMs to develop the design material, than you should feel justified in featuring the project in your portfolio with a desciption of your involvement.