I agree that she's at a bad state right now. Her kit has a lot of utility but very little burst, and from an AD carry you expect burst and sustained DPS, not utility.
Her shield is kinda counter-productive in the same sense that Revive is, because if you find yourself about to be hit by an enemy skillshot and be forced to shield it, it means you could have played better and dodged that skillshot instead.
Her ult is mainly for engaging or disengaging and you need to have AS-reliant jungle and toplaner before it even compares to Graves', Ezreal's and MF's ult in terms of damage output.
Her Q is just a worse version of Ezreal's Q unless you're playing against mouthbreathers who get hit twice by it.
Her W is probably the worst spell in her kit, all it does is push your lane and make you more vulnerable to enemy ganks.
Her passive is ok i guess, but provides no benefit for trading in lane. Every other AD's passive except Vayne's somehow improves trading and fighting in the bot lane, but speed is not a good stat for it.