Alexia stars in England Euro triumph
The 19-year-old was vice-captain in the side which travelled to Dublin for the three-day international tournament, with Ireland, Holland and Scotland also taking part.
A delighted Walker said: "It was great to win it. We absolutely annihilated all the other teams."
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Hide AdEngland eased to victory with an eight-wicket win against Holland, who were bowled out for 55, and a seven-wicket defeat of the hosts who were dismissed for 89. The Scotland match was called off due to rain.
Walker capped a brilliant week by skippering Sussex U-19s to victory over Kent in the Southern Division final on Sunday.
Sussex now meet Yorkshire in the final of the National Championships on August 26.