How do I properly counterplay Lux?

I just don't know... her Q is hard to see among many minions. E has very large hitbox and you must flash out of the zone before. R has wide hitbox and it's extremely hard to dodge, plus you may be forced to dynamically choose whether to take the R or to take the CCs launched sideways and die anyway. Can't ban her, as in my elo more bans are important such as Yasuo and Yi. What's counterPLAY to her, especially when you can't buy magic resist? (And please don't talk about champion picks, as we talk counterplay and not counterpicking)
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