Marianna is listed as the daughter of Joseph Klosak and Regina Waloszek. Marianna died relatively young, at age 31 from TB (Tuberculosis). Her death certificate says just Mary, but immigration says Marianna. I found what appears to be her on the 1910 Census. This is the only Mary or Marianna Klosak I could find, plus the dates are pretty close, and her father's name matched. I did a search on just Klosak's in Minneapolis, and this is the only entry close to a Mary. Here's my notes there:
Marianna is listed as Mary, single, age 23, immigrating in 1909, not able to read and write, from Austria Poland. She's living with her widowed father Joseph, who's 51, immigrated in 1890, and his occupation is a sewer. It's faded but it looks like he might work as a sewer in the paper factory, listed as part of the logging industry. His house is listed as owned free and that it's a house, not a farm. They live in Minneapolis, the district name is faded and illegible.
In 1911, Marianna immigrated and was listed as married, and age 21. I started asking around and it appears, some younger people in this time period, while they were single, went back and forth taking family members across. So someone with knowledge of the area, and the family, could help other family members on their journey. Marianna could have married just after this Census, the immigration record where she was listed as married was almost a year after this census page. Ages weren't always written on records correctly with language barriers.
I'm still not sure how this Marianna is an aunt of Branislawa Sanetra. But it seems she was here in The States, and then went back to get Bronislawa to bring her to her family.