Karen's Little Sister (Baby-Sitters Little Sister 6) (Babysitters Little Sister) by Ann M. Martin

Condition: great

Karen Brewer, Big Sister! Everybody used to love Karen. She was cute. She was the littlest sister. But now baby Emily is in their family, and Karen feels left out. Then Emily gets sick and everybody has to take care of her. Even Karen. And that’s when Karen finds out that being a big sister is the most fun of all!