I see nothing wrong with waking her at 2 hours to preserve bedtime and good night sleep.
However, that early waking sounds like OT to me, believe it or not. When my son has a long nap like that, we keep bedtime the same and sometimes even get an extra long night out of him. I think those days he's just extra tired -- maybe fighting a bug? lots of activity? reaching a new milestone? Who knows. You might try keeping bedtime the same or only move by 30 minutes instead of a full hour to keep her from being to OT at bedtime.