Pastels and Jingle Bells (Heavenly Bites #1)
Elaina Lee, Christine S. Feldman

But clearly she does not have a knack for this whole revenge thing, because before she can make good on her plans, Trish gets inadvertently drawn into Ian’s life in an unexpected way that lets her see just how different the man is from the boy he used to be. In fact, much to her astonishment, she actually starts to like the guy. A lot.
Trouble is, Ian doesn’t know who she really is, and explaining it to him is going to be a little difficult now—which is bad news, because Trish is starting to realize that all she really wants for Christmas this year… is Ian.