2 year old having hard time sleeping?

My daughter is almost 2 and doesnt want to sleep at night anymore. I stopped their naps so therefore at 8 they would take a shower and go to bed..that worked for a while until recently she doesn't want to nap or sleep at night. She will cry in her bed till i go and pick her up. It is really getting hard putting her to bed..but she needs her rest also. If she naps for like 20 minutes (she puts her self to sleep) she doest sleep at night. She will be up all night. What should I do..I need to get her back to the habit of sleep at 8. What should I do! thanks guys