my kid was a 5am girl at this age so 615 is lovely to me
I would push her first A time a touch more hun... she's UT for sure and it's just causing some OT over the day... Push her out to 2 hrs 30 for that first A time for a few days, then push to 2 hrs 45 if her naps are still not quite right.
If she short naps for the first nap and won't resettle, be sure to reduce her next A time a touch to keep OT under control.