When Lulu's parents go on vacation, the formidable Ms. Sonia Sofia Solinsky comes to babysit and Lulu behaves as badly as possible to get her to leave until Ms. Solinsky reveals her secret. Interest Level: 3-6 Reading Level: 5.7 ATOS Book Level: 5.9 AR Interest Level: LG AR Points: 2 AR Quiz: 165431EN Reading Counts Level: 8.6 Reading Counts Points: 5 Lexile Measure: 1010.