The 15-year-old beat fellow girl international Charlie Douglass (Brocket Hall) 4/3 in their quarter-final.
Kelly, a past winner of the English girls U13 and U15 titles, will play the 12-year-old Irish twin, Lisa Maguire, for a place in the final.
Yeovil’s Henrietta Brockway has also reached the semi-finals, defeating Scotland’s Sally Watson by one hole. She will play Denmark’s Sara Monberg.
Full details: www.lgu.org