Moving into the under-17 women's squad as its vice-captain, Walsh was considered a key player in the 2013 season. During the July 2013 women's Nordic Tournament she scored two goals, including one in the first minute of the play-off match against Iceland. In November 2013, she was named as a forward in the squad for the 2014 UEFA Women's Under-17 Championship (held in November and December 2013), helping England to a fourth-place finish in the competition, scoring their last spot kick in the 0(3)–0(4) third place play-off penalty shoot-out loss and being one of the England players included in the team of the tournament.
