shes in the limelight right now, i find riven is still a good anti everyone top lane, use your dash to dodge whatever you can, when you close in, she will go to bug mode, if you dont stun her before she uses skittering frenzy, you wont win that trade, poke her down, ult execute
also olaf>most, undertow, follow, his true damage thing, another undertow, once she gets low, Ragnarok and go cray cray
but the key here is you have to outplay her, shes very strong, and easy to capitalize on your mistakes,