So Be It by Sarah Weeks
Heidi is 12 years old, has a mentally disabled mother who can't say more than 23 words, and knows almost nothing about her mother or her background. Where did she come from? What is her mom's name?
We get to follow the determined Heidi as she travels to find out who she is. It's a great little novel, mysterious, endearing, insightful. Juvenile Fiction, very quick read.