Build and Runes
Try to wait a split second longer before trading with her, as a lot of Sivir players will turn on their Spell Shield pre-emptively.
Sivir players usually stay in lane forever and push waves continuously. Try setting up a gank if she pushes blindly without wards.
Avoid getting hit by Sivir’s boomerang both ways. – the second half needs to be removed as the projectile speed is much higher now.
If playing a champion with CC against Sivir, either use your stun when her spell shield is down or chase her until it runs out before using the stun.