THIS WAS A HARD ONE! I have spent more than a few hours trying to find your ALICE McGRATH SITLER that was born in late 1890's in New York.
I did find STEPHEN and ALICE SITLER on the 1915 New York City Census:
Head of household, STEPHEN SITLER, age 24, occupation is "elevator runner".
Wife, ALICE SITLER, age 18, occupation is "housework".
If you use ALICE's age on this Census, it would make her birth date approximately 1897. Is this the data you used to determine her birth date?
Census takers make mistakes - perhaps ALICE's age was not exactly 18 years. I could not find a ALICE McGRATH born about 1897 in New York City.
On the 1900 Manhattan, New York Census is a ALICE McGRATH, age 10, born July 1893 in New York; her parents are JAMES M McGRATH and MARY McGRATH.
Perhaps this is your ALICE McGRATH.
I also cannot find anything on ALICE McGRATH SITLER after the 1915 Census - I tried every trick I know with no results!
It appears that ALICE VIRGINIA SITLER's father, STEPHEN, had little to do with her either, as I find ALICE living with her father's mother, MINNIE, and father's step father, ALFRED HOPPE on the 1925 and 1930 New York, New York Census's.
I will keep looking! Sincerely, Melinda