The Irish went down 5-0 to Spain at Solitude in Belfast, with Nerea Eizaguirre scoring twice in the opening 14 minutes.
Laura Gutiérrez made it 3-0 before the break, with Lorena Navarro adding a second-half brace, her first goal arriving moments after coming off the bench.
But Denmark lead the table following a 7-0 thrashing of Ukraine at Seaview.
Agnete Nielsen and Sara Holmgaard got a goal in each half, with Freja Kjærsig Sunesen, Pernille Larsen (penalty) and Annica Schreiber adding one each after the interval.
