The Collaborative International Dictionary of English v.0.48:
Daughterly \Daugh"ter*ly\, a. Becoming a daughter; filial. [1913 Webster] Sir Thomas liked her natural and dear daughterly affection towards him. --Cavendish. [1913 Webster]WordNet (r) 3.0 (2006):
daughterly adj 1: befitting a daughter; "daughterly affection"