Widowed Elizabeth Kiely Coughlin married Timothy Walsh 27 August 1913, Manhattan
https://www.familysearch.org/ark:/61903/1:1:243R-1KNBut Michael Kiely and Elizabeth Shields might have had a daughter Margaret who married Michael Healy 16 October 1898, in Manhattan.
https://www.familysearch.org/ark:/61903/1:1:2445-D8VThis would eliminate your Maggie (Kiely) Leonard from being their daughter.
Unless there were two couples with these same names with daughters in Manhattan. - which is not at all impossible.
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that couple might have been from Limerick:
Elizabeth Shields, Michael Kiely
married Feb 1860, Cahirnorry, Ireland, Ireland, diocese of Limerick
This could be the Thomas Kiely boarding with the Coughlin family in 1900:
son Thomas b 26 Sep 1877, Limerick
their daughter Elizabeth baptized 13 February 1867, Mungret, Limerick
their daughter Margaret baptized 12 April 1871, Mungret, Limerick
So their Margaret was younger than her sister. Which means that
this Maggie could still be yours, arriving with her own sister Eliza.
This looks like it could be her immigrating in 1890 with what appears to her sister? Eliza?
Passenger List: https://www.familysearch.org/ark:/61903/1:1:QVPF-YBND