Few minutes before the mating ceremony began.
Ariel left Carter's room, thanking the moon goddess for the two females who came into the room the moment Avril found out she and Carter shared a kiss. Those two females were life savers.
The murderous glint that shone in Avril's eyes when Avril sniffed her made her realized, Avril had found out about the kiss.
So she ran as fast as her legs could carry her down the stairs leading to the passageway, this was a life and death situation. Ariel ran past many rooms and stopped when she reached the end of the passageway. She stopped and turned around looking for any backdoors to make her escape.
There were too many entrance doors in the house, the house was a large mansion. She should have expected it to turn out that way.