M.C.
My daughter stopped napping at 2 1/2. There was a transition time period, where some days she'd need a nap, and others when she could hold out all day. If you see she is getting particularly tired, but she refuses to nap, try just having a bit of quiet time. This could be anything from listening to music & cuddle time, to laying on the sofa and popping in a movie for a bit. We still do this one sometimes: pile up all her fav stuffed animals in bed, crawl in and have storytime while she lays down with her animal friends. I've found that if you can at least get some "down time" out of them, they can hold off til the night.