A friend of mine that knows of Lily's specific interest in the Holocaust recommended a book that she came across at her local library. I requested it at ours and read it yesterday afternoon. I don't want to give anything away, but it's a quick read, touching, sad, but encouraging at the same time. It's worth reading.
The book is titled "Hana's Suitcase" by Karen LeVine. I've added the link to Amazon on the left side bar under WW2 Unit Study.