Role in the series
Sadie is most notable for being Katie's best friend. They do everything together, even wear the same outfits (which Katie sews herself). Like Katie, Sadie is a sensitive, cheerful, and sweet-natured girl. She is boy-crazy and when she has grown attracted to someone, she (and Katie) will fawn over him endlessly. Sadie can be considered the more logical one between her and her best friend. Her biography even states that she "thinks with her head," contrasting to Katie, who "thinks with her heart." Sadie was even the one who came up with the idea of their summer job, making their own ice cream and selling it at the pier where they live. Her label of The Sweet Girl's Friend may imply that Katie is more independent and capable of making decisions on her own.