So the titular Noel in The Noel Diary title is actually Rachel’s birth mother, Noel. Turns out Rachel was adopted as a child, and she had ventured to Jacob’s mother’s house, searching for answers.

She discovers that Noel had written a diary during her tenure as a family nanny for the Turners. Naturally (because this is a Netflix holiday film), the journal is rife with secrets that help Rachel gain clarity about her real birth mother. Oh yeah — there’s some romance too, don’t worry!

Source: https://www.distractify.com/p/the-noel-diary-sequel