And how old are they?

My 14 month old gets about 10.5 hours. Problem is I think she wants to push her bedtime back to about 8:00-8:30. But she has to be up at the latest by 7:00am when she usually wakes up at 6:00am! Which means if I let her push her bed time back she won't be asleep till about 8:30-9:00 only giving her about on average 9 hours of overnight sleep. That's not enough for a 14 month old.

She is really fighting the sleep lately. Should I Just let her push it back and trust she'll sleep in till 7:00 (which will make mornings harder on us) and hope she'll increase her nap times?