A thyroid cancer survivor, Blasini competed in the Miss Puerto Rico Universe pageant in 2005, representing San Juan, and reached the 4th Runner-up position. Two years later, she went on to compete at the Miss Puerto Rico Universe pageant yet again, representing her home town Guayanilla. This time she won the crown and became the new Miss Puerto Rico Universe 2007. She was crowned by Zuleyka Rivera, who held the Miss Puerto Rico Universe 2006 title before she was crowned Miss Universe 2006.