Goodbye gift for Biomom?

I made a photobook on shutterfly of my baby's first year. She was in DSS care from 1 week on and I was fortunate enough for biofamily to give me newborn photos as well as the other foster parents giving me CDs with all the photos they took. My little one did not have a goodbye visit in the end but I plan on mailing the book once we finalize down the road!