I haven’t posted in Cafe Society that I am aware of- scanned the rules, and this looks like the place.
The book I am looking for is one I read as a ten-year-old in Vinton, IA- I believe it was in the Young Adult section.
It is about a girl who moves to live with her father when she is 11 or 12, somewhere on the east coast.
There is a boggy/fenlike area instead of beach, where there is about 20 yards of water that is only about six inches deep, but right before this girl moved here, a kid drowned, so the area is mostly avoided, as who could drown in six inches of water.
There is only one habitation near the water, which belongs to a rather odd, possibly witchy woman who befriends the girl.
The girl begins having these odd fugue moments when she is down at the water, where she is living the life of a girl her age in Norse settled early (pre-English-colonist) America (caveat; this may be eastern Canada), and she is in love and betrothed to a viking.
At some point (perhaps what started the fugues) she finds a viking artifact, apparently authentic, and learns more about them from the woman in the house by the sea.
The book ends with her nearly drowning in six inches of water as she attempts to swim out to sea to follow her love in the viking boats, as she knows from this life that the ships will never return as the woman in the house told her of the history of the early viking colony.
I have looked for this on and off for nearly three decades, including visiting the library I checked it out of three times. I cannot for the life of me recall this book.
If anyone can help, I would greatly appreciate it!