Advice please

Desperately need some advice!

I have posted before about my daughter’s sleep. She is still going through a nap transition from 2 naps to 1. She normally wakes up between 6 and 6:30. Nap is about 11:30. She only ever sleeps for 1 hour or 1.5 hours. Bedtime between 6:30 and 7.

She is waking up around 11 or midnight and going back to sleep. But the past few days she has been waking up at 5am. I am literally so exhausted. What am I doing wrong? Please help!