All Riot needs to do is lower the trap duration timer, that's it.
Her trap spam is the main reason she can do so good because she control zones so hard through them.
Her extra range isn't even a problem if I'm being honest.
Possible Nerf :
Yordle Snap Trap
ACTIVE: Caitlyn sets a trap at the target location that arms after 1.1 seconds and lasts up to 60 seconds. After the maximum amount of traps is laid down, deploying another immediately destroys the oldest one. Trap duration reduced to 30 seconds if placed in range of an enemy tower. Trap duration increased to 90 seconds if placed in brush.
Or if you don't think that's a big enough nerf.
Yordle Snap Trap
ACTIVE: Caitlyn sets a trap at the target location that arms after 1.1 seconds and lasts up to 45 seconds. After the maximum amount of traps is laid down, deploying another immediately destroys the oldest one. Trap duration reduced to 30 seconds if placed in range of an enemy tower. Trap duration increased to 60 seconds if placed in brush.
(90 seconds being the original duration)