It appears likely that they were married in Bohemia and immigrated as a family with her mother. Her father may have died before they left Bohemia.

Joseph and family are not on the 1875 Minnesota census for Winona. Possible brother for Joseph "Matthew Brabez".

In St Mary's (likely cemetary for him) there is an entry on the USG archives for a "Father Brabec". Findagrave has this listed as Frank Brabec and links it to his son. I suspect this may be his grave. Gives death year as 1880 but a birth year of 1849. Might be a damaged or hard to read headstone.

THE LATE RAILROAD ACCIDENT Winona Daily Republican, Friday November 28, 1879

A coroner's inquest on the death of Joseph Brabec, who was killed at the railroad crossing on Tuesday night, was held on Wednesday evening by Deputy Coroner Eastey with the following jury: H. D. Perkins, W. K. F. Vila, J. R. Hatcher J. H. Nagler, Geroge Warren and P. Bradley. After a careful examination of a number of witnesses the jury returned the following verdict: "We, the jury in the case of the death of Joseph Brabec, from the evidence produced, find that the deceased was accidentally killed by a train of the Chicago, Milwaukee and St. Paul Railway company on the 25th day of November, 1879, and from said evidence, the Railway company took all necessary precautions to prevent such accident."

https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=123833171