Leila looked at the new arrival with heightened vigilance. She mobilizes all sorts of actions she could use at the moment. All to at least ensure her group's safety above all.
No matter how strong she is in reality, she cannot truly show her tail as she likes. Unless the society broke out and the existing social norms are nonexistent, she will never show the world her true strength. Being strong in the current society is just calling for unwanted troubles in life.
Call her ruthless for this choice of hers. But she will never exchange other's lives for those she cares about nor is she willing to give up the life she had worked hard to build. In her past life to now, there are just too few people and creatures that can move her and arouse care from her. So each and everyone of them are incredibly precious to her.