After winning the toss, Guernsey elected to bowl first.
But Jersey proceeded to pile on the runs at Grainville.
Charlie Miles topped scored with 68 from 42 balls, including nine fours.
Her knock took the game away from the greens. Jersey had scored 18 runs when she came in to bat in the second over, and when she was eventually out at the start of the 12th they had 116 runs on the scoreboard.
They were eventually bowled out for 157.
Molly Robinson took four wickets in her four overs.
We fall to a heavy 104 run defeat in the T20I Inter Insular Vs. Jersey.
Molly Robinson the standout performer with very impressive figures of 4-0-15-4. #guernsey #cricket #greencaps pic.twitter.com/iUV0Z38tAI
— Guernsey Cricket (@guernseycricket) July 14, 2024
Guernsey then struggled to get runs on the board, with only three players creeping into double figures.
They were bowled out for 53 runs off 19.3 overs.