After a night out of healing and self-reflection ─ alongside with bonding between Gladys and Amiya their feelings were ought to change between one another. They talked about their feelings, while Amiya found comfort in Gladys arms as she grieved over her mother's loss ─ and how desperately she wanted to save her before Lunara got ahead of her. That's when Amiya was informed of Lunara's presence at Nina's house, she didn't even have to think about it.
Amiya took her grimoire and rushed to Nina's, she was determined to end whatever that was once and for all. She had to avenge her mother who was killed by Lunara ─ when she was in the witch's realm she couldn't be killed or contained for that's where she was at her strongest. But on Earth, Lunara was vulnerable even against Gladys and Amiya took advantage of it.