In the game, there's an item called "Zhonya's Hourglass" and "Stopwatch".
Those two items are to save yourself when you did a mistake on positioning.
Use it before you fall asleep with her E. You have 2.2 Seconds to react before you fall asleep.
"Flash", "Teammates", "Walk into minion wave to prevent her Q hit" are the ways.
Flash into somewhere that she couldn't have your vision. Teammate blocks when they have higher HP and you are low.
If you are talking about early laning Phrase. There should not have any wall for her to use her E. Which is why you should keep in distance with her.
Even if she's going to roam/gank you. Raise your map awareness by putting Trinkles at the possible spots. Her E is hard to lane because of speed projectile. It takes some times for her to target you, the one who's moving.
Knowing that she's missing, what you should do is not stay too close to the wall, is it that difficult?
If her E still hits you after all the methods I mentioned, that means it's the player's problem, not champion itself.