Hi,
I may be able to help on this one. I'm researching the Fitzgerald family also.
Information I have to date on Mary Josephine Fitzgerald as follows:
She married Joseph McDermott - in 1904
Source:
www.familysearch.orgref: Dublin South
Apr/Jun 1904
Volume: 2
P. 681
She is listed on Census 1911 under the name McDermott of 12 Mark Street (Trinity ward).
is at home with husband and 4 children.
In 1921 Mary Josephine McDermott(nee Fitzgerald) identified the body of her younger brother Leo Fitzgerald who was shot and died in Great Brunswick Street on14.03.1921
Source: irishnewspaperarchives.com
Paper: Irish Independent 1905 - current
Article: "Inquiries and funerals' dated: 18.03.1921
The other query regarding the 3 missing children of Thomas Fitzgerald & Lucinda Doolin (Lucinda is my connection) I may also be able to help.
Joseph, Elizabeth & Patrick born 21.03.1897
death refs for all three:
www.familysearch.orgApr/Jun 1897
Dublin South
Volume 2
Page: 496
they are buried in Glasnevin Cemetery in family plot: St. Bridgets JH 260.5
That's it if I find anything else I'll post it here
Forgive the lack of direct links - I'm new at this.
Regards
B.