Sleep at 9 months

My daughter is taking 3 naps a day normally... I feel like she goes to bed at a different time every night. Sometimes as early as 830 and sometimes as late as 10. How do you recommend a more predictable schedule? We do a bedtime routine. I feel like her sleep is just different every day. She wakes up normally in the morning between 7-8. Sometimes she’ll sleep through the night, sometimes she’ll wake up for a night feed and sometimes she wakes and wants to stay up for a couple hours... help please!!