Everytime i try, she just uses r and gets 200ms boost then flys away.

You just busted her ult.

Come again in 15-20 seconds.

+1 to that

You're supposed to gank a few times before she reaches lvl 6....

her ult has 140 sec cooldown pre lvl 11. abuse it.

her W has a 50 sec cooldown at rank 1. so yeah

Play Vi and never worry about people running away from you again.

How do you gank Ezreal? He just uses his 15 second cooldown flash and it was k.

How do you gank Corki? He just flies away on a 15 second cooldown and it was k.

How do you gank Kennen, Kassadin, Akali...

At least she's not using her ult to gib your laners?

I try to position myself between her and her escape route. That way if she Es onto me, she is pushing herself back into my ally.

If that doesn't work out, she'll blow flash or ult to escape.