Another idea would be to write or call the Minnesota Chippewa Tribe headquarters (if appropriate...?). Perhaps they have contact info: http://www.mnchippewatribe.org/http://www.mnchippewatribe.org/
Cass Lake area code is 218. By googling the name Beaudreau, Little Wolf, etc., one comes up with phone numbers for possible relatives. Your friend could use her knowledge of the family (plus the obituary previously mentioned) to assess the people found this way.