How we cite our quotes: (Part.Chapter.Paragraph)
Quote #4
Aunt Penn […] said When your mother phoned to tell me she was pregnant, she sounded happier than she'd ever sounded in her whole life about that baby. (1.6.8)
Daisy's fireside heart-to-heart with Aunt Penn, her mother's sister, represents the first time in her life she's able to talk about her mother or learn anything about who she was, and as such, is a very emotional experience for both of them.
Quote #5
I tried to pull myself together because I was Piper's guardian now and I thought I'd better act like it and make it clear to her that she was safe with me no matter what. And the thought made me fierce and strong like a mother wildebeest and all of a sudden I knew where people got the strength to pick up cars with babies lying under them which I always thought was made up. (1.15.10)
Aw, how sweet. Daisy experiences true unconditional love for the first time—like, ever—in this moment. It's like her heart of stone just melted into a big goopy puddle. The lifting up cars thing also foreshadows the rest of the book, where it turns out she will do just about anything to protect Piper.
Quote #6
And she said, I always wanted a sister and if I had one I would want her to be like you. […] I didn't tell her that I had never wanted a sister, in actual fact had spent most of my recent life desperately NOT wanting a sister, but that was only because of the circumstances in which I was likely to get one and besides I never imagined how much I could come to love someone like Piper. (1.16.14-18)
Looks like the familial feeling between Piper and Daisy is mutual. This is a big moment for Daisy because it's the first time she's heard someone express wanting her as a part of their family, and she realizes that she wants to be a part of it, too.