Who is daisy Mae and why is she important to sonny in rocket boys?

In the book "Rocket Boys" by Homer Hickam, Daisy Mae is Sonny's colorful and spirited pig. Sonny considers Daisy Mae important because she symbolizes his determination and resourcefulness in pursuing his passion for rocketry despite facing challenges and setbacks in his pursuit. Daisy Mae also serves as a source of inspiration and motivation for Sonny to keep working towards his dreams.