Can't help you re karen1chambers, but thought I would post the following, given your mention of Tullylish, New England and Rhode Island.
A Jane Millar Chambers, daughter of aThomas Chambers, married a William Fry of Tullylish in 1867. Three of their children settled or spent time in America. One, Ruth Fry, married a William Robinson before emigrating. Their children were born in Connecticut and one, William Fry Robinson, died in Rhode Island in 1950.
As you have had your DNA tested, it could be worth looking to see if anyone descended from the Fry/Robinson marriage have also tested and show any links with your Chambers line.