Nammu or Tiamat?

Technically, she is in a chaotic state but she can be calmed down when either reminded who she was as Nammu or who she was as a human. You can ask her what her hope was before being Tiamat or what she wanted to be if she never recalled being Tiamat. I hope that helps, she has actually calmed down a bit in my playthrough and just needs to be reminded that the world still has things to love, including you(or your friendship)

Sorry about that, that's a two fold issue in regards to the conjoined aspects of the Girl who has a crush on you and her past life as the Goddess Nammu whom the Assyrian people changed into a Dragon, hunting her for sport. They made her into a monster alongside various goddesses as they switched from a Matriarchal society to a patriarchal society. You should be able to talk to her about it, but most of what the AI has to offer on the matter is from mythology and how such a being would react when wanting revenge, only to find you not being afraid of her like everyone else.