This is a lot more interesting AND challenging. Were Mary's children Florence (1898) and Nellie (1900)? I cannot seem to find them in the 1900 census.
RC

If you can think of any (even tiny) bits of info on Mary that people in the past have mentioned, it may provide some clues that someone may come up with.

RC

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Mary had two children out of wedlock one was born abt. 1898, other born 1900 after the census were taken this is my grandmother. The grandparents raiser theses two kids.