Totally agree with the suggestions from Creations. Shorter night, perhaps delaying BT to 8:00 pm could help your daughter. Kids evolve fast, so whatever sleep amount was right in the past it, might be too much now.
My elder son started dropping the nap around 2 years old both at home and in the kindergarten. It was not every day, but ocasional. He just would not sleep, despite he spent 1 or 2 hours in the dark at midday. He tried to stay laying down, quiet, but it was impossible for him. He finally stopped naping around 3 years old. Some children need more sleep than others. My other son, however, he is now 2 years 2 months and always needs his nap for 2 hours, then he sleeps from 9:00pm to 7:30am.
My suggestion is to follow the hints of your child. Always offer your LO the chance of a nap. But if she is not sleeping afer 20 minutes, perhaps leave it for other day. Do not insist too much. It happens the same with food, if she feels a lot of preasure, or that you make a big deal of it, it can back fire.