Play lulu or quinn into her. Then just laugh because she can't even touch you.
Q has an abysmal windup, easy to dodge.
W is basically just an AA with some range. Easy to avoid if you keep yourself out of range. Tentacle attack wind ups take forever as well, easy to dodge.
E. Stay behind minions and juke. Don't be a one of those dumbass guys who walk in a straight line to avoid skill shots. It never works.
R. Never group up, or if you do, have something damning that will cause her to not want to, like an Amumu or a Nunu. Ult can be interrupted too as far as I know, so Azir ult, Vayne condemn, Poppy E, etc.
Other notes: she's super slow and has no gap closers.
Deny her team a sivir to remove gap closing.
Clear tentacles before she gets like 5 or 6 set up. Keeping the tentacles down removes a chunk of W's damage.
Play ranged champs like teemo, lulu, quinn, vayne, the donger, etc. Beat a lane bully with a meaner lane bully.