Bedtime?

I’m having trouble getting my LO to sleep for more than 9 hours at night. Her bedtime used to be 8 and she would wake up for the day around 7 or 8. However she was waking 4-5 times at night. I’ve done some gentle sleep training and pushed her bedtime up to 7/7:30. Now she’s waking 1/2 time per night which is fine for me, but she’s waking at 4:30/5am every morning. If you subtract the time she is awake through the night, she’s barely getting 9 hours of sleep and I’m told she should be getting 11 or 12. Is this happening to anyone else? I’ve tried to take away her evening nap, but she gets really overtired and it’s a nightmare to put her to bed. Not sure what to do here, any advice? She’s napping an average of 2.5 to 3 hours during the day.