She may not need naps anymore. You could make her bedtime a bit earlier and see how that works for you. She may get up too early but it's worth a try.
My grandchildren's bedtime at that age was 6:30 or 7. My 5 yo grandson's bed time is still 7 and my granddaughter's is 8 but she frequently goes to bed around 7 too. My grandson still takes naps but he does have a difficult time getting to sleep. My granddaughter stopped with the naps around 3. She still has quiet time on the weekends.
Both children usually wake up around 7.
I think that 8:30 is possibly too late for lights out at this age. Would she sleep thru if you did put her down when she said nap time? It might take awhile for her to get used to the new routine, another challenge.