The information you provided from US websites and US documents was just perfect for actually finding the families in Norway. The poster could study your postings here as a study plan for getting information from US sources FIRST! You did a very good job.
I think that Mrs. Albert Aasland was probably the informant for the death document. Many of the pre-printed section titles were ignored by the person who filled it out and the information just written in almost anywhere - that added a level of difficulty. She was obviously NOT a sister to 'Carrie' but might have been the closest relative available to provide any information -- even if the spellings suffered from 'Americanization.'