Peamount are now six points clear at the top of the Women's Premier Division.
Before a record crowd of 1,464 at Tallaght Stadium, the leaders beat Shamrock Rovers 1-nil.
Shelbourne are second after their five-nil win over Wexford Youths.
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Elsewhere, Bohemians beat Cork City 2-1, while it finished goalless between DLR Waves and Treaty United.
At the Showgrounds, Galway United beat Sligo Rovers 2-nil.