Is My niece sleeping normal for her age?

I watch my niece most of the time. She’s 6 months old. I have her more than her mother. Her mother has never had her on a schedule /: and I try but she doesn’t adapt because she goes back to her mom for a little and then it’s over. Anyways she usually falls asleep despite my trying at like 10 pm or at latest 11. She will not go to sleep any earlier. She sleeps until usually 7 am and then wakes up for a diaper change and a bottle and then goes right back to sleep. Then usually sleeps until 10 am. I know this is great and she’s sleeping enough and not waking a lot which is a goal. But she won’t really nap during the day and if she does it’s usually around 2 pm and for like a hour. That’s it she doesn’t take naps otherwise. I don’t know if this is a good or bad thing necessarily. Sometimes she fusses and seems tired during the day so I try to lay her down and she won’t nap.. it’s odd. But anyways what do you guys think?