Delilah is troubled by her awareness of being descended from the original Delilah, and thus being ultimately a half-breed with some of Elisa's genetic material in her. Humans aware of her "heritage" feel fear and disgust towards her, and Delilah fears that even her fellow gargoyles share in that emotion. As a result, she is outwardly tough, but inwardly very insecure. However, she will join Samson's resistance cell willingly enough, and become his second. 
Delilah will develop a romantic relationship with Samson during the resistance.