Velma Gratch and the Way Cool Butterfly by Alan Madison (2012)
It's hard to be Velma, the littlest Gratch, entering the first grade. That's because everyone has marvelous memories of her two older sisters, who were practically perfect first graders. Poor Velma—people can barely remember her name. But all that changes on a class trip to the magnificent Butterfly Conservatory—a place neither of her sisters has ever been. When a monarch roosts on Velma's finger and won't budge for days . . . well, no one will forget Velma ever again.