Originally a member of the Boston Rampage in 2007, Gallo developed into a strong cornerback with the Boston Militia, where she earned multiple All Star selections and three national championship rings. She won her fourth and fifth national titles with the Renegades. On April 27, 2019, she earned her 100th career victory on the field when the Renegades defeated the D.C. Divas 37-32. Before football, Gallo was the top cross-country athlete at Peabody (Mass.) Veterans Memorial High School.