Women were expected to do daily hard physical work in those days, especially in cold countries.
And that is exactly my point. To go viking, or to go a-viking generally means raiding and piracy. As a Berserker, my mission is to storm the village, slaughter everything that moves, and if there is anyone left living, they are prolly gonna end up as thralls in my stead back home
Lopping off her legs is just for illustration. Someone who is maimed so badly they can't work would prolly be killed.
I don't think she was part of any type of trade or anything else. If the Norse were on friendly trading missions, looking for brides or just a nice beach for some barbecue and volleyball, then why didn't they do more trading thru the years? There would be more than a couple of stories hinting at Europeans in America then. There would be more than a trace of American Indian DNA in Iceland. By now, it would be EVERYWHERE.
I think encounters between Indians and Vikings ended up in bloodshed.
As an aside, a guy in the cabinet shop got his fingers CHEWED OFF below the middle knuckles, all four of them, on his right hand, doing a stupid thing on the shaper with a stacked cutter set. You would have been amazed at how LITTLE they bled.