Sorry I never received these two messages from you back in July 2010 and was just re-checking this forum and saw them now in January 2011!
I would say approximate birth since her son b. Mar 1886 in Chicago, IL (may or may not be correct AT ALL but its a start) would be at least 1868 if she was 18; if son's stories hold up then she died between 1898 and 1910 I would say. Best guess to start for marriage date would be at least 9 months before his birth so June 1885 in Chicago also? Otherwise anything goes and your guess is as good as anyones!