Out of the seven novels, there is someplace where Dumbledore, I think refers to Lily when talking with Harry. He tells her how kind Lily was in nature and always willing to help.
Somehow I believe I'm not imagining this context. A plot bunny came over my way, and its survival could depend on that part of Lily's character. Since I only have my fifth and seventh both with me, I'd be glad if someone could post over the exact dialogue, with the book and chapter reference.