I offer another interpretation of the Girl. We are seeing only a moment frozen in time. It's been suggested that the Girl is opposing the bull, or that the bull is about to trample her. But here's another interpretation:
The Girl is a bull rider. As the bull charges at her, she will side-step it, grab it by the horns, swing onto its back, and ride it as a symbol of women taking their rightful place in the economy and riding the national prosperity, no longer standing meekly on the sidelines subservient to their husbands, fathers, and brothers. No longer must she hope that a man will find her adequate and will support her. The bull is hers as much as the men's.