How can I get my toddler to sleep through the night?

My two-year-old has trouble staying asleep. She will go to bed just fine, but a few hours later, she gets up and will stay up. I’m not sure what to try. It’s been going on for a while now, and I’m losing a lot of sleep over it. Any advice/suggestions would be greatly appreciated. No negativity, please. I will be talking to her Dr also, they couldn’t get her in until next week.