Looking for Millie Allen Collins Manchester NH

Im looking for the descendants of Millie Collins (nee Allen) last known address Manchester or Suncook, NH.
Husband Ned (Edward? Edmund?) Collins, and children Ernest, Muriel and Edward.

Edward Collins was from Castle Street, in Bray, Co Wicklow and Millie was from Ballybrack, Co Dublin.
Her parents were Archibald and Catherine Allen.

Millie was my grandfathers sister, but i cant find any trace of her on the Ellis island registers, and dont know for sure when she went to US. I do know that she came home for a visit in 1949, and stayed for about two months.
Any info would be welcome