Nap strike

My LO will be 8 months on the 16th. She's always been a great sleeper, but naps have been an on and off issue. She goes down without an issue, but she's having difficulty staying asleep for 45 mins or an hour. This is especially an issue bc I'm 5 months pregnant (with another March baby). On top of it, she has been waking super early in the morning (I can't blame this completely on the time change. Last week, she was sleeping until 830...this week 530.). Any suggestions for the naps or getting a later wake up? Thanks!!