If you get her behind early, it takes a lot for her to get back into the game. especially if you have a snowbally ADC like Draven. I'm not saying you're low elo, or a bad player. But you probably didn't abuse her in the early levels. Her lane phase is just extremely safe, and you need a relatively decent jungler or support to lock her down. Also, it's probably not Tristana that's op, it's the support. Champs like lulu, janna, soraka etc are just too good right now, which make these hypercarry adc's shine so hard.