The title is:
Finding Grace / Alyssa Brugman.
RACHEL HAS JUST graduated from high school and thinks she knows everything. Well, maybe not quite everything. Then she meets the mysterious Mr. Preston, who offers her a live-in job looking after Grace���a brain injured woman with a lovely house, grasping sisters, feral neighbors, and a box full of unfinished business. As Rachel tries to cope with the demands of her employment and the start of college, she���s also determined to fit together the pieces that were Grace���s former life. The more she finds out about the woman in her care, the more Rachel finds herself. Children���s Book Council of Australia Awards��� Shortlist for YA