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I suggest also being really, really stingent with MIA's. More then once I have lost lane as Kat, just walked over to bot lane, get a double kill, and carry the game from here. All that would have been avoided with one simple MIA.
Katarina naturally pushes the lane with Q's and W's. Normally this works in her favour - she wants to push so she can roam. Deny her roaming ability and she has nothing.