The 1900 and 1910 Norwegian census databases don't appear to show any such young woman.
So, WHEN did she enter the US? Have you found her on a passenger manifest at a US port of entry and gather all the little pieces of additional information that might be on such a document?
When she married did she have to give any additional information about herself? Such as WHERE in Norway born? Name of father and/or mother?
Possibly did a US obituary give additional information?