Final answer:
Lily's behavior of distress upon separation and resistance to comfort upon reunion with her mother indicates a resistant attachment style, which is characterized by resistance and rejection of the caregiver due to previously inconsistent caregiving responses.
Step-by-step explanation:
Lily exhibits behaviors that align with resistant attachment, characterized by her distress when her mother leaves and her rejection and resistance when her mother attempts to comfort her upon return. In the resistant attachment style, children appear clingy and are highly distressed during separation, but upon reunification, they may be difficult to comfort and may even show anger or resistance to the caregiver. This attachment pattern reflects an inconsistent level of response from the caregiver to the child's needs, which can lead to confusion and ambivalence in the child. Lily's behavior of becoming distressed when her mother leaves and resisting comfort upon her return suggests that her experiences with her caregiver may have been inconsistent or unpredictable, leading to a resistant attachment style.