I found this marriage:
Wisconsin Marriages, pre-1907
Name Marriage Date County Volume Page
Martha Prowatzke 01 Jul 1905 Milwaukee 37 0350
Louis Borchardt 01 Jul 1905 Milwaukee 37 0350
I don't know if that's who you are looking for, but Louis Borchardt and the time frame fits. Maybe Rose was a middle-or nick-name? Good luck!