Refueling Your Creativity--How to Plan in Recovery Time as You Write (and Finish) Your Book

Two of my private clients just completed their books.  A time for celebration, since they both worked extremely hard for the past year or more.  One of them, a first-time novelist, wrote me this week about how stunned she feels and how little creativity she can muster in other areas of her life.  She's a parent, great cook, and gardener, but nothing is feeling charged with energy at the moment.

She's happy her book is done--at last!--but worries about her lack of umph.  Is this normal?  Shouldn't she be gung-ho on the next project, so as not to lose momentum?