Jump em and Slump em

As far as I can tell this character is one you play if you want to prove you are simply better. Her abilities aren't vey good for 1v1s so by playing her you have committed to being a puss. There are a few ways to make her work and they differ heavily at different points in the game:

Early game: Don't die. Just like characters like Rama the early game of this character is essential and needs to be treated as such. If you die and give the opposing ADC a lead it will cause you to play for ganks and tower until mid game. Her 1 and 2 will both have to be used for lane clear so keep your 3 to jump away if the enemy ADC gets too close. If you dislike being forced into this playstyle then you are going to want to look for a different build.

Mid game: If you enter mid game the same or higher level then your fellow man this is where things get spicy. If you are a confident player then you can start to use jing wei's 1,2, and 3 to jump and kill your opponent. You start off by popping your 2 and waiting out the cooldown, after that jumping into your 1 to get the 40% atk speed buff will get you crit and atk speed, this is massive. then once in the air you use your 3 to jump the other ADC and deal some damage. If this doesn't kill them this is where your ult comes in. If you hit them with your ult at this point they should die, if not it is a good enough chase that you can follow up.

Late game: Late game is the same as mid game except most characters can be killed with a much simpler combo. If you use your 1 while an enemy is running at you and then simply kill them while there in the air, you win. Its a simple spell but quite unbreakable. This frees up your 3 as a run to prevent yourself from being jumped. Use this and basic sense and your good to go.

Have fun and troll :)