Neith

I'd say just watch for her broken weaves on the ground. Stay away from them, play around them and make it difficult for her to really lock you down. If she's smart and keeping her distance and is aware of her surroundings, it will be difficult to lock her down. If you can put the scare into her early, it might make her keep her distance and make her less effective. A lot of this might require some teamwork...baiting, making her feel confident, and having teammates sneak up and gank. (Depends also on mode)

If she's blown her kit, she's got long enough CDs that you can catch her and take her down. Try baiting her Back Flip then backing off a bit...as she approaches again, go for her since her escape is down. Consider getting Heavenly Wings to chase her down. I know these are all pretty simple and obvious, but that's what I've got =P

Biggest issue is that certain items are just very powerful. You've got Transcendence and The Crusher, both of which are considered strong right now and are perfect fits for her, and it makes it suck for you if you get caught by her abilities. I don't see either getting nerfed much, and it's also unlikely that Neith gets nerfed...maybe slight adjustments to her scaling if anything would be my guess...but even that might be unlikely. I don't think she's anything higher than A Tier.

She is actually pretty bad atm. for conquest that is meta wise. Because she is super easy to shut down for assassins (and assassins are doing great atm). Because her jump is so predictable and she has no CC-immunity etc.

But she is good in low elo games, because she has easy ways to confirm her damage and good poke. And she is very safe if ppl don't try to or know how to shut her down.