Nieminen showed the way to the big victory against the second best.
The 21-year-old scored a hat trick, where her first two goals were scored in the first period and the last was Luleå's 8-0 goal after 4.38 of the third period.
Nieminen was also noted for an assist, to one of Jenni Hiirikoski's two goals.
Luleå tops the table with 87 points.
The second Brynäs - who has one match less played - is ten points behind.