Richard Gaffney (Alice first husband) is alive in 1898, there is a newspaper article that states she accused him of assaulting her (but they dont sound too convinced as she doesn't keep her story straight and is not 'sober') and he had three months hard labour as a result.
I just lose Mary Sheridan after she marries Thomas in 1900, and then I can't find Mary Gertrude Sheridan after the 1901 census.
I have also found two other children belonging to Alice Gaffney and Richard, Maraget and Patrick, but I think Patrick may have died. Not sure of Margaret, she was born in 1885. The last child is born, as far as I can see, in 1893. I found these entries on rootsireland.
Name: Patrick Gaffney Date of Birth: 09-Sep-1893
Date of Baptism: 11-Sep-1893
Address: 8 Hendrick Street Parish/District: ST.PAUL'S ARRAN QUAY
Gender: Male County Co. Dublin
Denomination: Roman Catholic
Father: Richard Gaffney Mother: Alice Dunne
Occupation:
Sponsor 1 /
Informant 1: Margaret Kennedy
Sponsor 2 /
Informant 2: Not Recorded Not Recorded
Notes:
L
Name: Mary Gafney Date of Birth: 18-Oct-1890
Date of Baptism: 20-Oct-1890
Address: 5 Haymarket Parish/District: ST.PAUL'S ARRAN QUAY
Gender: Female County Co. Dublin
Denomination: Roman Catholic
Father: Richard Gafney Mother: Alice Dunn
Occupation:
Sponsor 1 /
Informant 1: Louise Kelly
Sponsor 2 /
Informant 2: Not Recorded Not Recorded
Notes:
L
[WIFES SURNAME BEST GUESS, REG. IS DAMAGED]
Name: Margaret Gaffeney Date of Birth: 31-Oct-1885
Date of Baptism: 02-Nov-1885
Address: 50 Queen Street Parish/District: ST.PAUL'S ARRAN QUAY
Gender: Female County Co. Dublin
Denomination: Roman Catholic
Father: Richard Gaffeney Mother: Alicia Dunne
Occupation:
Sponsor 1 /
Informant 1: Not Recorded Not Recorded
Sponsor 2 /
Informant 2: Margaret Hickey
Notes:
L
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Another possible child of Alice Dunne, 2 years before she married.
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1881/02817/2033598.pdf