I think kinswoman does imply a more distant relationship than sister-in-law but I wouldn't like to say for definite. I had one like that in some of the wills I was looking at recently for my tree and she was a cousin of some kind, married to another cousin.
You can view those Kent records on FamilySearch if you actually go to a FamilySearch Centre, despite not being a member of their church.
I'll have a look and see if I can find anything to help with those people...
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