I saw your request today. Lavinia was born and raised at the farm Skrøyvstad at the far end of the lake Salen north of the town Namsos. She was the sister of one av my relatives, Johanna.
There are several places called Valvika in Norway, but I guess it is the place at Salsnes, near the place she was born. Picture:http://klikk-i-na.origo.no/-/image/show/1877207_ferieparadis...