Juliet, We've been through periods of no napping here, too, both before and after Iris's arrival. My strategy was to take her out to play on the playground in the morning for a good hour (more if possible) before lunch (also gets them hungrier, a bonus-- a nice big lunch induces a nice nap), get her good and tired, and tell her that she needed to stay in her room for quiet time. She went back to napping.
That said, I think the time is coming soon when we will have to drop the nap unless we want to stay up with her until 11:00 pm every day. Hopefully that day will coincide with her starting preschool so I still get my "me" time!