Sweethearts by Sara Zarr
After losing her soul mate, Cameron, when they were nine, Jennifer, now seventeen, transformed herself from the unpopular fat girl into the beautiful and popular Jenna, but Cameron's unexpected return dredges up memories that cause both social and emotional turmoil.

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Lock and Key
When she is abandoned by her alcoholic mother, high school senior Ruby winds up living with Cora, the sister she has not seen for ten years, and learns about Cora's new life, what makes a family, how to allow people to help her when she needs it, and that she too has something to offer others.