Nap time

My daughter is 3, and has decided to stop taking naps most days. If she doesn't nap then I make sure she at least lays down and rests for an hour. I'm not ready for her to stop taking nap yet, but I don't know that there is much I can do about it. When did your little one stop taking a nap? Do you put them to bed earlier? She will start to get very cranky in the evenings, and I know it's because she is tired and didn't take a nap. Should I keep pushing to get her down for a nap or just keep making her lay down and rest? This is really a struggle for me.