That's not the reason.
The reason was, Nutaku has so far always been one event ahead for Awakenings when compared to DMM. On DMM, Sol is getting Awakened in the NEXT event, so she should've come to Nutaku on THIS event.
I really hope that Nutaku won't now change schedules to match the DMM schedule, since I just bloody moved all the Awakenings one event backwards...
 ̄\_(ツ)_/ ̄