My dd was the same and at that same age that started happening and i was so sad...we ended up doing g a few days, maybe 2 or 3 with no nap and just early bedtimes and then she would have a nap day. She couldn't go more than a few days without one. She's 4.t and hasn't napped in probably 2 years but my friends 4 and 5 yr old still nap and go to bed at 7. Dd is in bed at 730 most nights and up at 630 or 7 am