New Leaf Literary agent Suzie Townsend negotiated the deal. The New York Times has the scoop:
On Wednesday, New Leaf announced that HarperCollins had signed Ms. Carmack to a three-book deal that includes “Losing It,” for a sum in the “high six figures.” The HarperCollins “Losing It” e-book will be available before the end of the year. A print version will follow in the spring.
Losing It was the first book by the “twenty-something” author. Over at her blog, Carmack reminisced about the early days of her book: “I remember watching the adds on Goodreads and getting SO excited when LOSING IT had 1,000 adds. It has since blown that number out of the water, and it’s all thanks to you guys. Amy at the YA Sisterhood and all the bloggers from the blog tour did such a tremendous job sharing the news about my little book.”