It will help to find as much as you can in the US first, since that may lead you to her parents death dates.
You can go to www.familysearch.org
(free site) I started with a general search for Katie Laplante, born 1871-1873 in Minnesota. I actually found two marriages for her, the first one in 1889 for a Kattey Laplante and Anton Benjamin. Her parents were listed as Edward Laplante and Maggie Moore
I also found a female child, born and died in 1880, parents Edward Laplante and Margaret LaPlante. They were living in Houghton Township, keeneewaw, Michigan
There is also a marriage here for John Laplante, same parentshttps://familysearch.org/pal:/MM9.1.1/FC8B-TSN
I encourage you to explore the familysearch site if you have not already. You can do a search from the home page, or you can scroll down and search by countries, then each country will have many links. Start by putting in less information, and it helps to leave a couple of years leeway with dates, as the person's age will vary with when the census was taken.