Build and Runes
Buying a Banshee’s Veil will significantly cut her damage down!
Disabling(silence/stun/snare/knock-up) Leblanc after she uses her Distortion will stop her from casting it again.
Try to stay behind minions so that her chain won’t be able to hit you.
Find out which spell she upgrade as first, Q or W. When she max. Q – push lane hard, she has no waveclear. When she max. W – stay away from range of her W all the time, try to make her Distoriton useless.