Mezue ahịrịokwu na-esonụ: N'ọnwa Machị afọ 2007, Duggan dị afọ iri na ise si n'oche ndị nnọchi bọọlụ gbapụta goolu n'asọmpi mbụ ya na England n'okpuru afọ iri na asaa. Kemgbe ahụ, ọ nọchitere anya England na Under-19, Under-20 na Under-23 ọkwa. Ọ gbara bọọlụ na FIFA U-20 Women's World Cup n'afọ 2008 na 2009.
N'afọ 2010. N'ụbọchị Duggan mere afọ iri na asatọ, o nyere otu n'ime goolu abụọ n'asọmpị UEFA Women's Under-19 Championship nke afọ 2009 nke England meriri, megide Sweden na Belarus.