New Novel - Introducing the Back Story

My new sweet Regency Novel is a follow on novel from Sunday's Child published by MuseItUpPublishing. The heroine is one of the characters in Sunday's Child. It is essential to include some of her back story. Although I didn't intend revise the novel until I finished the first draft I realised that I needed another way to present the back story to the reader. After worrying about it while I wrote 22,600 words, I realised the best thing to do would be to write a prologue with the relevant, but amended, text taken from Sunday's Child. I drafted the prologue this morning and think I've solved the problem.