Summer of the Wolves by Lisa Williams Kline
Stepsisters, yes. Friends? Maybe ...
"I smelled the wolf now-sharp and musky. I scanned the pen and saw a shadow behind one of the bushes that might be another wolf. Probably two of the most miserable looking creatures I'd ever seen." -from Summer of the Wolves
Stephanie and Diana are having a hard time adjusting to life as new stepsisters. The girls "pretend" to like each other, but it's pretty hard considering they are complete opposites. When their new family takes their first-ever vacation to a horse ranch in North Carolina, not even long horse-back rides in the forest can tame their tempers. Diana's anger issues and Stephanie's fear of everything prove disastrous, until Diana discovers the caged wolves in the deep woods. She vows to free them, and surprisingly, Stephanie agrees to help. But their actions have unforeseen consequences, and if there's any chance to make things right, Stephanie and Diana must put their differences aside