Izzy Bella — L. Frank Baum

Izzy Bella, short for Isabella, does not want to invite boys to her party until she learns that she can have a cow "friend" party with girls and boys. In this second book in the series, one friend in particular helps Izzy catch rainbows and she learns how not to design clothes and bake cakes. Check out Izzy Bella: Says Oh Wow To Preschool (Volume 1).