Problem solved. From the Beck, Lund, Nechvatal, Mlinaric Tree at ancestry.com
https://www.ancestry.com/family-tree/person/tree/151598239/person/352097256895/factsMary Mlinaric (Minerick)
1912–
Birth 4 OCT 1912
Death Unknown
Fact Details
1919
Orphaned at age 7 to the St. Vincent Orphanage. At age 8 she was given to Janes and Ellen Sloan.
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The tree has nothing else on her. So it looks like the Sloans in South Carolina adopted her in a way, but she kept in touch with her siblings.
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For those interested,
This is the way she shows up on the 1930 Census, with the Sloans:
1930 Census, Charleston SC
Apr 1, 1930
at 315 East Bay
does not own a radio
James Sloan, 69, married 1st at 39, born in England, parents in Ireland, arrived 1887, naturalized, gear man, shipyard
Ellen Teresa Sloan, 65, married 1st at 35, born in South Carolina, parents in Ireland, no occupation
Mary Francis Sloan, niece, 17, single, born in Michigan, father in Ireland, mother in Michigan, stenographer, insurance office
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and in Ellen's obituary:
Charleston News and Courier, December 19, 1949
Mrs Ellen Prunty Sloan, widow of James Patrick Sloan, of 315 East Bay Street, died today at a local infirmary.
Surviving are ... four nieces ... Sister M Agatha, of Highston, N.J.
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And I found this along the way, from a grandchild of Nick Minarich:
"Back in 1982 when I was 13 years old, I went with my parents to a big Minarich family reunion in upper peninsula Michigan (above Wisconsin) in a town called Hermansville.
"My grandfather Nicholas was born circa 1911 (he never was quite sure of the year he was born!) and was one of some large number of 9(?) kids ...
"My immediate grandfather was unfortunately orphaned at a relatively young age, and it was his older sister Mary who ensured that the siblings, who were each placed in separate homes, all remained more or less 'in touch' with each other (Mary became a nun at age 15 and became ordained, if that's the right word, as 'Sister Agatha'). "
http://genealogyforum.katarincic.com/default.aspx?g=posts&t=114--------
I might get in touch with the tree manager and/or the poster at genealogyforum and complete their records on Mary Francis (Sis. M. Agatha) Minarich Sloan.
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Thank you to everyone for the help which got me to focus on this Minarich family.