The Good-Pie Party by Liz Garton Scanlon illustrated by Kady MacDonald Denton

Posy does not want to move and resists any good-bye parties.  She and her two friends are lamenting the upcoming separation when they decide to bake a pie.  The process of making a pie becomes therapeutic.  They decide to host a "good-pie" party, not a good-by party.
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Borrowed from the library.