Other Ideas to incorporate:

There are a lot of things to do at the American Girl website that can be used for printables. There are even cards of each dolls family and friends that could be printed and included in the lapbook. You will find all the printables here.

There are also trading cards sold at book stores that could be used in the lapbooks.  They are about $3.00 per packet.  You could store some in your lapbook in a pocket.