SLEEP for 13 month old

My 1-year-old has transitioned to a one-nap schedule. They are almost 13 months old. The nap usually lasts 1 1/2 to 2 hours. Usually waking at 7 am and going to bed around 8. She has been on a one nap schedule for a month. At first it was great. We tried to go back to two naps and she refuses.

We aim for 10 hours of wake time. She is waking up for hours at night.

Someone suggested more wake time and that did not help. I'm going to try to do an earlier bedtime tonight. Any other suggestions?