How to actually counter Diana
Is it just buy it or ban it moment? 
Is it just buy it or ban it moment? 
Diana has a lot of tough lane opponents. Jungle diana has very little presence pre6 compared to most junglers.
Don't play at night, simple.
Problem solved.
Step forward into her and opposite of her Q direction. Boom countered.
Mind blown
[{quoted}](name=Kat for Elo,realm=NA,application-id=3ErqAdtq,discussion-id=EP72WGvr,comment-id=0004,timestamp=2015-05-11T17:32:47.982+0000)
Step forward into her and opposite of her Q direction. Boom countered.
Mind blown
Actually she can control the distance of her Q so if she sees a pattern in your dodging she'll just shorten the distance and catch you with it that way. For the most part you should only go within range of her Q if you're sure you can survive her full burst or if you have teammates who can peel nearby.
It's not a whole lot different than an Ahri Q. Ahri's Q is easy to dodge, but you have to do it predictively because it has a fast travel speed once it's cast. Good Ahri players will lead you slightly in the direction that you show a knack for dodging towards so that they can land both sides of the orb.
destroys her
Try not to stand close to minions for her to both CS and hit you with Q in one fell swoop; make her pick one or the other.
Once she hits 6, she can use Q-R for easy powerful poke that leaves her with another R to escape or repeat again instantly once Q is up; if she hits you with Q try to get out of range for the Moonlit debuff to drop off then go in.
Her W's shield doubles if all 3 orbs explode, which is really quick to happen on a minion wave; approach her away from minions and try to deny that second shield from proccing.
Her passive is very strong, don't just think she has no damage without mana. Proper kiting to let all her skills time out is key; her passive stacks, her shield orbs, and her Moonlight debuff.
Is she jungling? She can barely gank before 6, so have your jungler gank while she's still afk farming. Beware counter-jungling her early though, because her sustain and clear is ridiculously amazing, so she's probably going to have more health than you.
Oh one more thing; she lines up her skillshot different from anyone else. Since it's a crescent, she will try to get a strange angle to hit a minion wave, so learn the pattern she uses to get into position and do that. At point blank range that isn't a factor; since it's so easy for her to Q at melee range, you might be able to bait her into doing it and just back off and make her miss.

''Thanks for jumpíng to me, now die''